HP Series Watt 10:1 DC-DC Converters

Transcription

1 92 Watt : DCDC Converters These extremely compact DCDC converters incorporate all necessary input and output filters, signaling and protection features, which are required in the majority of applications. The converters provide important advantages, such as flexible output power through total current limitation, extremely high efficiency, excellent reliability, very low ripple and RFI noise levels, full inputtooutput isolation, negligible inrush current, soft start, over temperature protection, inter ruption time, and input over and undervoltage lockout. Features.8" TE.5"." 3 U Extremely wide input voltage range from 2.5 to 5 VDC in the same model RoHScompliant 5 year warranty Class I equipment Compliant with EN 555, EN 5232, and IEC/EN 2, 3,, 5,, 8 Fire&smoke: Compliant with EN 5552 Input over and programmable undervoltage lockout including inhibit function Low inrush current ms interruption time to independent, isolated outputs: no load, overload, and shortcircuit proof Rectangular current limiting characteristic Redundant operation (n), sense lines, active current sharing option, output voltage adjust Hipot test voltage 2.8 kvdc Very high reliability and efficiency up to 92.5 % All PCB boards protected by lacquer Extremely slim case ( TE, mm), fully enclosed Safetyapproved to the latest edition of IEC/EN 95 and UL/CSA 95 pending Table of Contents Description...2 Model Selection...2 Functional Description...5 Electrical Input Data...8 Electrical Output Data... Auxiliary Functions...7 Electromagnetic Compatibility (EMC)...9 Immunity to Environmental Conditions...2 Mechanical Data...23 Safety and Installation Instructions...2 Description of Options...2 Accessories...27

2 92 W : DCDC Converters Description The converters are particularly suitable for rugged environ ments, such as railway applications. They have been de signed in accordance with the European railway standards EN 555 and EN All printed circuit boards are coated with a protective lacquer. The converter covers a total input voltage range from 2.5 to 5 VDC in the same model. The input is protected against surges and transients occurring on the source lines. The outputs are continuously open and shortcircuit proof. Full system flexibility and n redundant operating mode are possible due to series or parallel connection capabilities of the outputs under the specified conditions. When several con verters with T option are connected in parallel, a singlewire connection between these converters ensures good current sharing. LEDs at the front panel and an isolated output OK signal indicate the status of the converter. Voltage suppressor diodes and an independent overvoltage monitor protect the outputs against an internally generated over voltage. The converters are designed using transformers with planar technology. The input voltage is fed to a booster, which generates approximately 7 V. If V i is higher, the booster becomes simply a diode. The resulting inter mediate voltage supplies the power trains. There are two powertrains fitted to a converter, each con sisting either of a regulated single output with syn chronous rectifier or of a regulated main output with a tracking second output. The output power may be flexibly distributed among the main and the tracking output of each powertrain. Close magnetic coupling in the transformers and output inductors together with circuit symmetry ensure a small deviation between main and tracking output. A storage capacitor charged to approx. 7 V enables the powertrains to operate during the specified interruption time. As part of a distributed power supply system, the lowprofile design significantly reduces the required volume without sacrificing high reliability. The converters are particularly suitable for 9 rack systems occupying 3 U / TE only, but they can also be chassismounted by screws or fitted with a heat sink. The connector type is H5. The fully enclosed blackcoated aluminum case acts as heat sink and RFI shield, such protecting the converter together with the coating of all components against environmental impacts. Model Selection Note: Only standard models are listed. Other voltage con figu ra tions are possible on request. Table : Model Selection V o nom [V] Output, Output 2, 3 Input voltage Efficiency Model Options P o nom 5 [W] P o 5 [W] V o nom [V] P o nom 5 [W] P o 5 [W] V o min 3 [V] V o cont [V] V o max 3 [V] min [%] η 2 η 2 typ [%] min [%] typ [%] HP9RTG HP9RTG HP59RTG HP9RTG HP9RG HP9RG HP9RG HP239RG HP259RG U, V, B U, V, T 7, B HP29RG U, V, B , 2 5, 5 5, 5 2, , 2 5, 5 2, 2 2, 2 5, 5 2, 2 2, HP9RG HP9RG HP9RG HP39RG HP59RG HP59RG HP9RG U, V, T 7, B U, V, B Efficiency at T A = 25 C, V i = 2 V, I o nom, V o nom 2 Efficiency at T A = 25 C, V i = V, I o nom, V o nom 3 Short time; see table 2 for details! Isolated tracking output 5 P o nom is specified at T amb = 7 C P o 5 is specified at T amb = 5 C and V i = 22 V. For V i = 22, only 9% of P o 5 are continuously possible 7 T replaces R 8 Bel Power Solutions & Protection Page 2 of 27

3 92 W : DCDC Converters Part Number Description Continuous operating input voltage V i : Series.8 to 37.5 VDC... H...P Number of outputs: Single output ( mm case)... Double output ( mm case)... 2 Triple output ( mm case)... 3 Quadruple output ( mm case)... Nominal voltage output /output, V o/ nom : 5. V... 2 V V V... other voltages... 7, 8 Other specifications and additional features..., Nominal voltage output 2 /output 3, V o2/3 nom : 5. V... 2 V... 5 V... 2 V... other voltages and features... 8, Operational ambient temperature range T A : to 7 C... 9 other... Output voltage adjust (auxiliary function)...r 3 Options: Current sharing... T 2 UVL (preadjusted V i min )... Uxx 5 V (rotary switch to adjust V i min )...V Heatsink,, mm...b, B, B3 RoHScompliant for all substances...g H P 9 R B G Customerspecific models. 2 Only available for singleoutput powertrains. Option T excludes option R, except for singleoutput models; refer to table 2. T is standard for singleoutput models 3 The Rinput influences the first power train only; refer to table 2. Models with 2 mm case length. Just add 5 to the standard model number, e.g. HP9RG HP89RG. 5 For full compatibility with former P Series, the start voltage can be preadjusted depending on the nominal battery voltage. Excludes opt. V. Excludes opt. U. Note: The sequence of options must follow the order above. Example: HP9RBG: DCDC converter, input voltage.8 to 37.5 V, outputs providing 2 V each, heatsink B, ambient temperature of to 7 C, RoHScompliant. Note: All models exhibit the following auxiliary functions, which are not reflected in the type designation: input and output filters, primary referenced (programmable undervoltage shutdown with inhibit function), sense lines (single, double, tripleoutput models only), and LED indicators. Product Marking Basic type designation, approval marks, CE mark, warnings, pin allocation, patents, MELCHER logo, specific type de signation, input voltage range, nominal output voltages and output currents, degree of protection, identification of LEDs, batch no., serial no. and data code including production site, version, and production date. 8 Bel Power Solutions & Protection Page 3 of 27

4 92 W : DCDC Converters Output Configuration The HP Series allows high flexibility in output configuration to cover almost every individual requirement, by simply wiring outputs in parallel, in series, or in independent config uration, as shown in the following diagrams. Parallel or serial operation of several converters with equal output voltage is possible, using the current share option T to provide reasonable current sharing. Choose suitable singleoutput models, if available. Note: Unused tracking outputs should be connected in parallel to the respective regulated outputs. i R Singleoutput model JMa R Vo Vo S OK OK S Vo Vo Fig. a Standard configuration (singleoutput model) JMa Doubleoutput model Vo 8 Load i R JM5a Doubleoutput model Vo2 S2 S2 Vo2 Vo S S Vo Load Fig. b Series output configuration of a doubleoutput model. The second output is fully regulated. JM7a Tripleoutput model Vo i 28 S S Vo 2 8 Load i 28 S S Vo 2 8 Load R 32 Vo2 S2 S2 Vo2 8 Load 2 R 32 Vo2 Vo2 Vo3 Vo3 8 Load 2 Load 3 Fig. c Independent doubleoutput configuration. Both outputs are fully regulated i R Quadrupleoutput model JM8b Vo Vo Vo Vo Vo2 Vo2 Vo3 Vo Load Load Load 2 Load 3 Fig. e Common ground configuration of output with and independent configuration of output 2 and 3 Fig. d Independent tripleoutput configuration. Output 3 is tracking i R Quadrupleoutput Vo3 8 model Vo3 JM9b Vo2 Vo2 Vo Vo Vo R Vo 2 8 Load Fig. f Series configuration of all outputs (V o = 9 V for HP). The Rinput influences only outputs and. For the values of R and R2 see Output Voltage Adjust. R 2 R 8 Bel Power Solutions & Protection Page of 27

5 92 W : DCDC Converters Functional Description The converters are designed using transformers with planar technology. The input voltage is fed to a booster, which generates a voltage of approx. 7 V. If V i is higher, the booster becomes simply a diode. The storage capacitor C hu is charged by a current source to max. 7 V and enables the powertrains to operate during the specified interruption time. The resulting intermediate voltage, between 5 V (during interruption time) and 5 V, supplies the power trains. There are two powertrains fitted to a converter, each con sisting either of a regulated single output with syn chronous rectifier or of a regulated main output with a tracking 2 nd output. As part of a distributed power supply system, the lowprofile design significantly reduces the required volume without sacrificing high reliability. The converters are particularly suitable for 9 rack systems occupying 3 U / TE only, but they can also be chassismounted by screws or fitted with a heat sink. Connector type is H5. The fully enclosed Aluminum case acts as heat sink and RFI shield, such protecting the converter together with the coating of all components against environmental impacts. The converters are equipped with two independent forward converters, switching 8 phaseshifted to minimize the input ripple current. These two forward converters are called powertrains (PT), exhibiting either a single output with synchronous rectifier or two isolated outputs, one fully regulated and the other one tracking (semiregulated), thus providing up to four output voltages. The output power may be flexibly distributed among the main and the tracking output of a doubleoutput powertrain. Close magnetic coupling in the transformers and output inductors together with circuit symmetry ensure small deviation between main and tracking output. The low input capacitance results in low and short inrush current. After the isolating transformer and rectification, the output filter reduces ripple and noise to a minimum without affecting the dynamic response. Outputs 3 and, if available, are tracking (semiregulated). An individual current limiter built in to of each powertrain limits the total output current of that powertrain in an overload condition. This allows flexible power distribution of the outputs of each powertrain. All outputs can either be connected in series or in parallel; see Electrical Output Data. An auxiliary converter provides the bias voltages for the primary and secondary referenced control logic and auxiliary circuits. The converter is only enabled, if the input voltage is within the operating voltage range and above the programmable undervoltage lockout threshold () such limiting the input current dependent on the nominal battery voltage. All output are equipped with a suppressor diode and an independent monitor sensing the output voltage of the main output. In the case of an overvoltage, it influences the control logic respectively. The temperature is monitored and induces the converter to disable the outputs. After the temperature has dropped, the converter automatically resumes. 8 Bel Power Solutions & Protection Page 5 of 27

6 92 W : DCDC Converters Block Diagrams R T 8 JMd Auxiliary converter (9 khz) Powertrain ( khz) Vo 2 S S 8 Vo Input filter Booster (35 khz) C hu NTC Output filter 32 PE 2 C Y Powertrain 2 ( khz) Vo n.c. R A D Models with opt. V Vo 28 B C Models with opt. U logic NTC Out OK logic C Y 22 Out OK 2 Out OK Fig. 2a Block diagram of singleouput models R or T JMd Auxiliary converter (9 khz) Powertrain ( khz) Output filter Vo 2 S S 8 Vo Output Input filter Booster (35 khz) C hu NTC C Y PE R C Y A B Models with opt. U D C Models with opt. V logic Powertrain 2 ( khz) NTC Out OK logic Output filter C Y Vo2 8 S2 S2 Vo2 22 Out OK 2 Out OK Output 2 Fig. 2b Block diagram of doubleoutput models 8 Bel Power Solutions & Protection Page of 27

7 92 W : DCDC Converters R or T JM2d Auxiliary converter (9 khz) Powertrain ( khz) Output filter Vo 2 S S 8 Vo Output Input filter Booster (35 khz) C hu NTC C Y 32 C Y PE 2 R A B 28 Models with opt. U D C Models with opt. V logic Powertrain 2 ( khz) NTC Out OK logic Output filter C Y Vo2 Vo2 8 Vo3 Vo3 Output 3 Output 2 22 Out OK 2 Out OK Fig. 2c Block diagram of tripleoutput models R JM3e Input filter Auxiliary converter (9 khz) Booster (35 khz) C hu Powertrain ( khz) NTC Output filter C Y Vo 8 Vo 2 Vo Vo Output Output 32 C Y PE 2 R A B 28 Models with opt. U D C Models with opt. V logic Powertrain 2 ( khz) NTC Out OK logic Output filter C Y Vo2 Vo2 8 Vo3 Vo3 Output 3 Output 2 22 Out OK 2 Out OK Fig. 2d Block diagram of quadrupleoutput models 8 Bel Power Solutions & Protection Page 7 of 27

8 92 W : DCDC Converters Electrical Input Data General conditions: T A = 25 C, unless T C is specified. Sense lines connected directly at the connector R input and input not connected Table 2: Input data Model HP Unit Characteristics Conditions min typ max Operating input voltage continuous I o = I o max V i For 2 s without lockout T C min T C max V i nom Nominal input voltage range 2 () V i abs Input voltage limits 3 s, without damage 5 I i Typical input current V i nom, I o nom see fig. 3 P i Noload input power V i min V i max, I o = 7 P i inh Idle input power, 2 V i min V i max, V = V.5 C i Input capacitance 3 8 µf R i Input resistance mω I inr p Peak inrush current 5 ma V i = 37.5 V, I o nom t inr d Duration of inrush current 7 t on Startup time after inhibit V i min.8 V, I o nom 25 5 Startup time at power on V I i min, o nom 25 5 V = 5 V Typical values; dependent on model 2 Converter inhibited with the pin 3 Not smoothed by the inrush current limiter at startup (for inrush current calculation) See fig. V W ms Input Protection, Function, Fuse No fuse is incorporated in the converter. Consequently, an external circuit breaker or fuse at system level should be installed to protect against severe defects; see table 3. Table 3: specification (typ.) and recommended external fuse depending on the nom. battery voltage Battery R V i min (on / off) Fuse recommended 2 V.9 V 2.5 V 25 A fast, Littlefuse 3 3 V 75 kω 2.3 V 7 V A fast, Schurter SP 2 8 V 7 kω 25. V.2 V 2.5 A fast, Schurter SP 2 72 V.9 kω 3 V 3 V 8 A fast, Schurter SP 2 9 V kω 59.5 V 8 V 8 A fast, Schurter SP 2 V 7.5 kω 7 V 5 V.3 A slow, BEL fuse MRT 3 all < Ω Converter disabled Size.3 32 mm 2 size 5 mm mm for 2 s Note: An internal R is fitted in models with option U in order to provide compatibility with the converters Series BP EP. Reverse polarity protection is provided by antiparallel diodes across the input, causing the external circuit breaker or fuse to trip. A suppressor diode protects against voltage spikes beyond V i abs. The converter is designed for an extremely wide input voltage range, allowing for connection to all common railway batteries. However, the programmable input undervoltage lockout (, pin 28) should be adjusted carefully in order to limit the input current at startup; see fig 3. 8 Bel Power Solutions & Protection Page 8 of 27

9 92 W : DCDC Converters I i [A] JM83 V i min [V] JM8a V i [V] 5 R kω Fig. 3 Typ. input current versus input voltage at nominal load (HP) Fig. R versus switchon voltage Table 3 shows the values of the resistor R, connected between and, versus the resultant minimum input voltage and the resultant maximum input current. Fig. shows more values of R versus startup voltage. For stationary batteries, a higher startup voltage might be advantageous. Note: If (pin 28) is connected to (pin 32), the converter is disabled. See also Inhibit Function. Inrush Current The converters exhibit small input capacitance C i. However, a short peak current appears when applying the input voltage. Note: The storage capacitor C hu is charged by a current source and does not contribute to the inrush current. The peak inrush current can be found by following calculation; see also fig. 5: V i source I inr p = (R ext R i ) JMc L ext R ext R i C i Converter Vo Load Vo Fig 5 Input circuit to calculate the inrush current Input Stability with Long Supply Lines If a converter is connected to the power source by long supply lines exhibiting a considerable inductance L ext, an additional external capacitor C ext connected across the input pins im proves the stability and prevents oscillations. JM85d L ext R ext R i Converter Vo C ext C i r i Load Vo Fig Input configuration to consider stability 8 Bel Power Solutions & Protection Page 9 of 27

10 92 W : DCDC Converters Actually, a HP Series converter with its load acts as negative resistor r i, because the input current I i rises, when the input voltage V i decreases. It tends to oscillate with a resonant fre quency determined by the line inductance L ex t and the input capacitance C ext C i damped by the resistor R ext. The whole system is not linear at all and eludes a simple calculation. One basic condition is given by the formula: L ext P o max dv i C i C ext > ( r i = ) R ext V i min ² di i R ext is the series resistor of the voltage source including supply lines. If said condition is not fulfilled, the converter may not reach stable operating conditions. Worst case conditions are lowest V i and highest output power P o. Low inductance L ext of the supply lines and an additional capacitor C ext are helpful. Recommended values for C ext are given in table, which should allow for stable operation up to an input inductance of 2 mh. C i is specified in table 2. Table : Recommended values for C ext V B nom Capacitance Voltage 2 V 5 µf V 3 V µf 3 V 8 V 7 µf V 72 V 2 µf 25 V V µf V Efficiency The efficiency depends on the model (output configuration) and on the input voltage. Some examples: η [%] HP9RTG η [%] HP239RG 9 JM7 V i = V 9 JM8 V i = V 8 V i = 2 V 8 V i = 2 V Fig. 7a Efficiency versus V i and P o (HP)...8 P / P o o 5.2 Fig. 7b Efficiency versus V i and P o (HP23)...8 P / P o o 5 η [%] HP9RG η [%] HP9RG JM88 JM79a 9 V i = V 9 V i = V 8 V i = 2 V 8 V i = 2 V P / P o o P / P o o 5 Fig. 7c Efficiency versus V i and P o (HP) Fig. 7d Efficiency versus V i and P o (HP2 and HP) 8 Bel Power Solutions & Protection Page of 27

11 92 W : DCDC Converters Electrical Output Data General conditions: T A = 25 C, unless T C is specified. Sense lines connected directly at the connector Rinput and input not connected Table 5a: Output data for singleoutput powertrains Output Singleoutput powertrain 5. V 2 V 5 V 2 V Unit Characteristics Conditions min typ max min typ max min typ max min typ max V o Output voltage V i nom, I o nom V ow Worst case output voltage V i min V i max T C min T C max, (.2 ) I o nom V o P Overvoltage protection V o L Overvoltage shutdown I o Nom / Max output current 3 V i min V i max 2 / / / /. I o L Output current limit T C min T C max v o noise Output Switch. frequency V i nom, I o nom 5 noise Total incl. spikes BW = MHz v od Dynamic Voltage deviation V V load i min V i max t 5 (.5 ) I regulation Recovery time d o max ms v o tr Output voltage trim range (via Rinput). V i min V i max (. ) I o nom V α vo Temperature coefficient of V o I o nom, T C min T C max ±.2 ±.2 ±.2 ±.2 %/K If the output voltages are increased above V o nom through Rinput control or remote sensing, the output power should be reduced accordingly, so that P o max and T C max are not exceeded. 2 Breakdown voltage of the incorporated suppressor diode at ma (5. V) or ma ( 2 V). Exceeding this value might damage the suppressor diode. 3 First value is for P o nom (T A = 7 C), second value for P o 5 (T A = 5 C); see also Output Power at Reduced Temperature Measured according to IEC/EN with a probe described in annex A 5 Recovery time until V o returns to ±% of V o ; see Dynamic Load Regulation Output voltage limitation by an additional electronic shutdown V A mv pp 8 Bel Power Solutions & Protection Page of 27

12 92 W : DCDC Converters Table 5 b: Output data for doubleoutput powertrains. General conditions as in table 5a. Output Doubleoutput powertrain 2 V Unit Main output Tracking output Characteristics Conditions min typ max min typ max V o Output voltage V i nom, I o nom V ow Worst case output voltage V i min V i max T C min T C max (.2 ) I o nom See Output Voltage Regulation V o P Overvoltage protection V o L Overvoltage shutdown.3 none I o Nom / Max output current 3 V i min V i max 2.5 /. 2.5 /. I o L Output current limit T C min T C max 8. Switch. frequency V v o noise Output noise i nom, I 5 5 o nom Total incl. spikes BW = MHz v od Dynamic load Voltage deviation V i min V i max.5.8 V t 5 d regulation Recovery time (.5 ) I o max ms v o tr Output voltage trim range (via Rinput). V i min V i max (. ) I o nom See Output Voltage Regulation α vo Temperature coefficient of V o I o nom, T C min T C max ±.2 %/K V A mv pp V Table 5c: Output data for doubleoutput powertrains. General conditions as in table 5a. Output Doubleoutput powertrain 5 V 2 V Unit Main output Tracking output Main output Tracking output Characteristics Conditions min typ max min typ max min typ max min typ max V o Output voltage V i nom, I o nom V ow Worst case output voltage V i min V i max T C min T C max, (.2 ) I o nom See Output Voltage Regulation See Output Voltage Regulation V o P Overvoltage protection V o L Overvoltage shutdown 7 none 28 none I o Nom / Max output current 3 V i min V i max 2. / / / / 2. I o L Output current limit T C min T C max v o noise Output Switch. frequency V i nom, I o nom noise Total incl. spikes BW = MHz 5 5 v od Dynamic Voltage deviation V V load i min V i max t 5 (.5 ) I regulation Recovery time d o max 2 ms v o tr Output voltage trim range (via Rinput). V i min V i max (. ) I o nom 8..5 See Output Voltage Regulation 3 2. See Output Voltage Regulation α vo Temperature coefficient of V o I o nom, T C min T C max ±.2 ±.2 %/K If the output voltages are increased above V o nom through Rinput control or remote sensing, the output power should be reduced accordingly, so that P o 5 and T C max are not exceeded. 2 Breakdown voltage of the incorporated suppressor diode at ma. Exceeding this voltage might damage the suppressor diode. 3 First value is for P o nom (T A = 7 C), second value for P o 5 (T A = 5 C); see also Output Power at Reduced Temperature Measured according to IEC/EN with a probe described in annex A 5 Recovery time until V o returns to ±% of V o ; see Dynamic Load Regulation Output voltage limitation by an additional electronic shutdown V A mv pp V 8 Bel Power Solutions & Protection Page 2 of 27

13 92 W : DCDC Converters Parallel and Series Operation The first outputs of power trains with equal nominal output voltage can be connected in parallel. Where available, we recommend ordering of option T. Any output can be connected in series with any other output. If the main and the tracking output of the same power train are connected in series, consider that the effect of the Rinput is doubled. Notes: If a tracking output is not used, connect it in parallel to the respective regulated main output. Connection of several outputs in parallel should include measures to approximate all output currents. Singleoutput power trains exhibit currentshare pins (T), which must be interconnected. If no currentshare pins are available, the load lines should exhibit a similar resistance. The pins (pin 28) should exhibit an individual resistor for each converter. If the shutdown function is used, each pin must be controlled individually. If several outputs are connected in series, the resulting voltage may exceed the SELV level (SELV = Safety Extra Low Voltage) and require additional safety measures in order to comply with international safety standards. Parallel operation of two doubleoutput converters with seriesconnected outputs is shown in fig. 9. The link bet ween the T pins ensures proper current sharing, even though only the first outputs are influenced by Tfunction. Sense lines are con nected directly at the connector, and load lines have equal length and section. R P Doubleoutput model Vo2 Out OK Out OK R JM9a S2 S2 Vo2 Vo S S Vo R p Doubleoutput T model Vo2 Out OK Out OK JM7a S2 S2 Vo2 Vo S S Vo Load Doubleoutput model Vo2 Out OK Out OK R S2 S2 Vo2 Vo S S Vo Load Doubleoutput model T Vo2 S2 Out OK S2 Out OK Vo2 Vo S S Vo Fig. 8 Series connection of doubleoutput converters. Sense lines connected at the connector. Fig. 9 Parallel operation of 2 doubleoutput converters with seriesconnected outputs. 8 Bel Power Solutions & Protection Page 3 of 27

14 92 W : DCDC Converters Redundant Systems An example of a redundant system using converters with 2 regulated outputs (HP) is shown in fig.. Load is powered with 5. V and load 2 with 2 V. The converters are separated with ORing diodes. If one converter fails, the remaining one still delivers the power to the loads. If more power is needed, the system may be extended to more parallel converters (n redundancy). Current sharing of the 5. V outputs is ensured by the interconnected T pins, whereas the sense lines are connected after the ORing diodes to maintain the correct output voltage. For the 2 V outputs, no active currentshare feature is available. As a result, 2 little diodes D s (loaded by small resistors R s ) simulate the voltage drop of the ORing diodes. Reasonable current sharing is provided by load lines of equal length and section. R p 2 JM7a Doubleoutput T model Vo2 S2 D S Out OK Out OK S2 Vo2 Vo R S Load 2 S S Vo 2 Doubleoutput T model Vo2 S2 Out OK S2 D S R S Out OK Vo2 Vo S S Vo Load Wires of equal length and section Fig. Redundant configuration (example) Hot Swap In applications using the hot swap capabilities, dynamic output voltage changes during plugin and plugout operations may occur. 8 Bel Power Solutions & Protection Page of 27

15 92 W : DCDC Converters Output Voltage Regulation Line and load regulation of the regulated outputs is so good that input voltage and output current have virtually no influence to the output voltage. If a tracking output is not loaded, its output voltage may rise considerably. Thus, unused tracking outputs should be connected in parallel to the respective main output. The dynamic load regulation is shown in fig.. V o V od V o ±% V o ±% V od t d t d t I o /I o nom.5 µs µs 52c t Fig. Typical dynamic load regulation of the output voltage Tracking Outputs The main outputs and 2 are regulated to V o nom independent of the output current. If the loads on outputs 3 and are too low (<% of I o nom ), their output voltage tends to rise. V o3 and V o depend on the load distribution: If all outputs are loaded with at least % of I o nom, V o3 and V o remain within ±5% of V o nom. The chart fig. 2 shows the regulation of the tracking outputs under different load conditions. If I o = I o and I o2 = I o3 or if the tracking outputs are connected in series with their respective regulated outputs, then V o3 and V o remain within ±% of V o nom, provided that the load is at least I o min. Because the HP Series uses main transformers in planar technology, the tracking outputs follow the main outputs very closely. Note: If a tracking output (V o3 or V o ) is not loaded, it should be connected in parallel to the respective main output (V o3 parallel to V o2, V o parallel to V o ). V o3 [V] 25 V V o3 < 28.3 V JM89 I o2 = 3. A I o2 =.5 A I o2 =. A I o2 =.5 A I o2 =.2 A 2 V 23 V I o3 [A] Fig. 2 2 V tracking output V o3 = f(i o2 ). The same chart applies for V o = f(i o ) 8 Bel Power Solutions & Protection Page 5 of 27

16 92 W : DCDC Converters Output Current Protection All outputs are continuously protected against opencircuit (no load) and shortcircuit by an electronic current limitation. Single and doubleoutput powertrains have a rectangular current limitation characteristic. In double output powertrains, only the total current is limited allowing free choice of load distribution between the two outputs of each power train up to a total I o I o = I o max or I o2 I o3 = I o max. All outputs are protected by an individual suppressor diode. In addition, the main outputs are monitored. In the case of an overvoltage (caused by a defect), the monitoring circuit resets the PWM logic and the output voltage. Interruption Time The interruption time t hu (ridethrough time) of the system complies to class S2 ( ms) according to EN 555:7, clause 5... It is valid for interruption and a shortcircuit of the input voltage V i (V i 2 V). After such an event, the system is ready for the next event after s. Note: t hu is the minimum interruption time, but depending on different operating conditions, this time can be much longer. Thermal Considerations and Protection If a converter is mounted upright in free air allowing for unrestricted convection cooling and is operated at nominal input voltage (2 V to V) and nominal output power at T A max (see table Temperature specifications), the tempe rature T C measured at the measurement point on the case (see Mechanical Data) approaches T C max after an initial warmup phase. However the relationship between T A and T C depends heavily on the operating conditions and system integration. The thermal conditions are influenced significantly by the input voltage, the output current, airflow, and the temperature of the adjacent elements and surfaces. T A max is therefore in contrast to T C max an indicative value only. Operating the converters with output currents beyond I o nom requires a reduction of the maximum ambient temperature or forcedair cooling in order to keep T C below C. When T C max is exceeded, the thermal protection (sensors near the output rectifiers of each powertrain) is activated and disables the outputs. The converter automatically resumes when the temperature drops. At T A 7 C, P o nom is continuously possible, if V i.8 V. At T A 5 C, P o 5 is continuously possible, if V i 22 V. Note: Forced cooling or an additional heat sink (option B, B, B3) improves the reliability or allow T A for going beyond T A max provided that T C max is not exceeded. In rack systems without proper thermal management the converters must not be packed too closely together! In such a case the use of 5 or TE front panels is recommended. P o [W] JM9 P o max P o JM238 V i = 2 V V i [V] Fig. 3 Possible continuous output power P o versus V i at T A = 7 C (HP and HP8).35 P o nom. P o nom P o nom.7 P o nom convection cooling V i = V forced cooling.5 m/s T C max T C Fig. Output Power derating versus T A and with forced air cooling 8 Bel Power Solutions & Protection Page of 27

17 92 W : DCDC Converters Auxiliary Functions Inhibit Function The input (pin 28) can also be used as shutdown (for the function see table 3). The response time t r is specified in table 2; t hu is the interruption time ( ms). V o /V o nom. t d on t on t r t hu t off t f JM87a OC R I V 28 JMa Output t 32 i (opt. U, V) t 2 PE Fig. 5 Typical output response to the signal (used as inhibit) or to the inhibit signal with option U or V Fig. Circuit for the inhibit function (not with options U, V) The current coming out from pin 28 () is typ.. ma (< ma). If pin 28 is left opencircuit, the voltage is 5 V. The converter is disabled when V is.7 V. Note: For converters with opt. U or V, see Primary Inhibit for Option U and V (page 2). Current Share Function If the Tpins of parallelconnected singleoutput powertrains are linked together, the powertrains share their output current evenly. Refer to section Parallel and Series Connection. Output Voltage Adjust of V o and V o Note: With open Rinput, V o = V o nom. The converters allow for adjusting the output voltage of powertrain. Powertrain 2 cannot be adjusted, except for singleoutput converters. Programming is performed by an external resistor R ext or R ext2, connected to the Rinput. The adjust range is limited to the values given in table Electrical Output Data. With doubleoutput powertrains, both outputs V o and V o are influenced by the Rinput setting simultaneously. Adjustment of V o (or V o ) is possible by means of an external resistor R ext. V o is tracking the voltage V o. The trim range of V o (or V o ) is specified in table 5 as V o tr. Depending on the value of the required output voltage, the resistor shall be connected: either: Between the Rpin and S (or Vo ) to adjust the output voltage to a value below V o nom : V o R ext kω V o nom V o or: Between the Rpin and S (or Vo) to adjust the output voltage to a value greater than V o nom : (V o 2.5 V) R ext2 kω 2.5 V (V o /V o nom ) Note: Adjustment by an external voltage source is not re com mended. 8 Bel Power Solutions & Protection Page 7 of 27

18 92 W : DCDC Converters JMa V ref = 2.5 V kω Control logic 29e Vo R Vo R ext2 R ext SD R Doubleoutput powertrain R Vo Vo Vo Vo 2 nd powertrain R R 2 Load Load Fig. 7 Output voltage control by means of the Rinput Fig. 8 Output adjust of V o and V using R. The other outputs o ext are not influenced. Sense Lines Important: Sense lines should always be connected. Incorrectly connected sense lines may damage the converter. If sense pins are left opencircuit, the output voltages are not accurate. This feature enables compensation of voltage drop across the connector contacts and the load lines including ORing diodes in true redundant systems. Applying generously dimensioned crosssection load leads avoids troublesome voltage drop. To minimize noise pickup, wire sense lines parallel or twisted to the respective output line. To be sure, connect the sense lines directly at the female connector. The voltage difference between any sense line and its respective power output pin (as measured on the connector) should not exceed the following values at nominal output voltage. Table : Voltage compensation allowed using sense lines Output type Total drop Negative line drop 5. V Output <.5 V <.25 V 2, 5 V Output <. V <.5 V LEDs and Out OK Monitor When the input voltage is in range, the green LED In OK is shining provided that the inhibit function is not activated. The voltage(s) of the main output(s) are monitored. When the main outputs are in range, the LED Out OK and Out OK 2 are activated. In addition a galvanically isolated opencollector signal Out OK is generated. This function is not adjustable, but if the Rinput is used to adjust V o, the trigger levels are tracking. The open collector output is conducting, if the monitored conditions are fulfilled (tolerances typ. ±3%). Otherwise, the input voltage is out of limits or the output current is too high. Dimensioning of resistor value R p V p 5 ma Caution: The Out OK circuit is protected by a Zener diode. To prevent damage, the applied current I OK should be limited to ±5 ma. The Zener diode should not be exposed to more than.25 W. Table 7: Output OK data Characteristics Conditions min typ max Unit V OK OutOK voltage Output okay, I OK < 5 ma.8.5 V I OK OutOK current Output out of range, V OK < V µa 8 Bel Power Solutions & Protection Page 8 of 27

19 92 W : DCDC Converters 5b V p Output monitoring circuit I OK R p 22 Out OK V OK 2 Out OK Fig. 9 Output OK circuit All outputs are protected by an individual suppressor diode. In addition, the main outputs are monitored. In the case of an overvoltage (caused by a defect), the monitoring circuit resets the PWM logic and the output voltage. Electromagnetic Compatibility (EMC) The HP Series was successfully tested to the following specifications: Electromagnetic Immunity Table 8: Electromagnetic immunity (type tests) Phenomenon Standard Level Coupling mode Value applied Electrostatic discharge (to case) Electromagnetic field Electrical fast transients / burst Surges Conducted disturbances Power frequency magnetic field Waveform Source imped. IEC/EN contact discharge 8 V 2 3 p 3 Ω /5 ns air discharge 5 V 5 pf p IEC/EN 3 IEC/EN Test procedure In oper. Perf. crit. 2 pos. & neg. discharges yes A x antenna V/m AM 8% / khz N/A 8 8 MHz yes A 5 antenna V/m 8 MHz V/m MHz AM 8% / khz N/A 5 V/m 27 MHz 3 V/m 5 MHz 3 capacitive, o/c ± V p bursts of 5/5 ns; i/c, i/ i, direct ± V p 2.5 / 5 khz over 5 ms; burst period: ms 5 Ω s positive s negative transients per coupling mode IEC/EN i/c ± V p 2 Ω 5 pos. & 5 neg / 5 µs surges per i/ i ± V p.5 μf coupling mode IEC/EN IEC/EN i, o, signal wires VAC ( dbµv) yes yes yes AM 8% / khz 5 Ω.5 8 MHz yes A 3 9 A/m s in all 3 axes yes A i = input, o = output, c = case 2 A = normal operation, no deviation from specs; B = normal operation, temporary loss of function or deviation from specs possible 3 Exceeds EN 5232: table 5.3 and EN 52: table 2.. Corresponds to EN 5232: table 5. and exceeds EN 52: table Corresponds to EN 5232: table 5.2 and EN 52: table 2.2 (compliance with digital communication devices). Corresponds/exceeds EN 5232: table 3.2 and EN 52: table.2. 7 Covers EN 5232: table 5.3 and EN 52: table.3. 8 Corresponds to EN 5232: table 3. and EN 52: table. (radio frequency common mode). 9 Corresponds to EN 52: table 2.3. A A A 8 Bel Power Solutions & Protection Page 9 of 27

20 92 W : DCDC Converters Electromagnetic Emissions All conducted emissions (fig. ) have been tested ac cording to EN 55, group, class A. These limits are much stronger than requested in EN 5232:, table 2., and coin cide with EN 52:, table.. The limits in fig. apply to quasipeak values, which are always lower then peak values. In addition, the values for average must keep a limit dbµv below the limits in fig. (not shown). Radiated emissions have been tested according to EN 55, group, class A. These limits are similar to the requi re ments of EN 5232: and EN 52:, both calling up EN A:, table. The tests were executed with horizontal and vertical polarization. The worse result is shown in fig. 2. dbµv HP, Vin = 2 V, Iout = 2x. A, 9 W Class A, Feb5 dbµv VUS EMC Labatory, HP, Vin = VDC, Out = 2 V, x A (92 W), B932739, U, Mar5 8 EN 55 A qp EN 55 A av JM75 8 EN 55 A qp EN 55 A av JM MHz MHz Fig. a HP: Typ. disturbance voltage at the input (V i = 2 V, I i nom, resistive load, quasi peak and average). Fig.b HP: Typical disturbance voltage at the input (V i = V, I i nom, resistive load, quasi peak and average). dbµv/m VUS EMC Labatory, Vin = 2 VDC, Vout = x 2 V / A (92 W) Testdistance m, Class A, HP,5Mar5 dbµv/m VUS EMC Labatory, Vin = VDC, Vout = x 2 V / A (92 W) Testdistance m, Class A, HP,Mar5 5 EN EN 55 A JM77 5 EN 55 A JM MHz Fig. 2a HP: Typ. radiated disturbances in m distance (V i = 2 V, I i nom, resistive load, quasi peak). 5 5 MHz Fig. 2b HP: Typ. radiated disturbances in m distance (V i = V, I i nom, resistive load, quasi peak). 8 Bel Power Solutions & Protection Page of 27

21 92 W : DCDC Converters Immunity to Environmental Conditions Table 9: Mechanical and climatic stress Test method Standard Test Conditions Status Cab Db Be Ad Damp heat steady state Damp heat test, cyclic Dry heat test steady state Cooling test steady state Low temperature storage test IEC/EN 8278 MILSTD8D section 57.2 EN 555:7, clause 3..7 IEC/EN 82 EN 555:7, clause 3..5 ST, IEC/EN 822 EN 555:7, clause 3.. IEC/EN 82 EN 555:7, clause 3.. IEC/EN 82 Temperature: ±2 C Relative humidity: 93 2/3 % Duration: 5 days Temperature: 55 C and 25 C Cycles (respiration effect) 2 Duration: 2x 2 h Converter not operating Converter not operating Temperature: 7 C (85 C) Converter Duration: h ( min) operating Temperature, duration: C, 2 h Converter Performance test: 25 C not operating Temperature, duration C, h Converter then startup not operating Na Thermal shock IEC/EN 82 Temperature, duration: 58 C, h Converter Temperature, duration: 8 C, h not operating Ka Fc Fh Ea Salt mist test sodium chloride (NaCl) solution Vibration (sinusoidal) Random vibration broad band (digital control) & guidance Shock (halfsinusoidal) EN 555:7, clause 3.. IEC/EN 82 IEC/EN 82 MILSTD8D section 5.3 Temperature: 35 ±2 C Duration: Acceleration amplitude: Frequency ( Oct/min): Test duration: 8 h.35 mm ( Hz) IEC/EN 82 Acceleration spectral density:.5 g n2 /Hz IEC/EN 8227 MILSTD8D section 5.3 Shock EN 555:7, clause 3.. EN 373 sect. class B, body mounted Simulated long life testing at increased random vibration levels EN 555:7, clause 3.. EN 373 sect. 8 and 9 class B, body mounted Body mounted = chassis of a railway coach Frequency band: Acceleration magnitude: Test duration: Converter not operating 5 g n = 9 m/s 2 ( Hz) Converter Hz operating 7.5 h (2.5 h in each axis) 8 5 Hz.9 g n rms.5 h (.5 h in each axis) Converter operating Acceleration amplitude: 5 g n = 9 m/s 2 Converter Bump duration: ms operating Number of bumps: 8 (3 in each direction) Acceleration amplitude: Bump duration: Number of bumps: Acceleration spectral density: Frequency band: Acceleration magnitude: Test duration: 5. g n ms 8 (3 in each direction).2 g n2 /Hz 5 5 Hz.8 g n rms 5 h (5 h in each axis) Converter operating Converter operating 8 Bel Power Solutions & Protection Page 2 of 27

22 92 W : DCDC Converters Temperatures Table : Temperature specifications, valid for an air pressure of 8 hpa (8 mbar) Model 9 (standard) Unit Characteristics Conditions min typ max T A Ambient temperature Converter operating 7 T C Case temperature convection cooled, V i nom, I o nom 2 C T S Storage temperature Not operational Operation with P o 5 requires reduction to T A 5 C; see Thermal Considerations. 2 Over temperature shutdown at T C > C (NTC) Reliability Table : MTBF and device hours Ratings at specified case temperature Model MTBF Environmental between failures conditions Demonstrated hours 2 Accord. to IEC 238 HP 95 h non interface 3 Profile: Permanent Phase, 35 cycles per year. delta T / Cycle 3 C, 3 C Tae (average outside ambient temperature), 5 C Tac (average temperature inside system), Tau.57 (annual ratio of time in permanent working model at Tac temperature) 2 Statistical values, based upon an average of working hours per year and in general field use over 5 years; upgrades and customerinduced errors are excluded. 3 Power supply is not in direct contact with the final application. 8 Bel Power Solutions & Protection Page 22 of 27

23 92 W : DCDC Converters Mechanical Data The converters are designed to be inserted in a 9 rack according to IEC Dimensions in mm. pin.3 H G F E Key Code System European Projection A B C D (5.5) Front plate. 27± M3; 5 mm deep Measuring point of case temperaturet C measuring point of case temperaturet C AIRFLOW JM85a option V Ø.5 Silkscreen without opt. Bx HEAT SINK (opt. Bx) Silkscreen with opt. Bx holes for opt. B, Ø 2.7 ( ) 2 pin ±. ±. 7 pin 32 Back plate ( TE) Out OK 2 In OK ±.25 = Ø 3.7 Fig. 22: Case Q5, weight approx. 5 g Aluminum, fully enclosed, black, EP powder coated Note: Long case, elongated by mm for a 2 mm rack depth, is available on request: Add 5 to the part number. 8 Bel Power Solutions & Protection Page 23 of 27

24 92 W : DCDC Converters Safety and Installation Instructions Connector Pin Allocation The connector pin allocation table defines the electrical potentials and the physical pin positions on the H5 connector. Pin 2, protective earth, is a leading pin to ensure that it makes contact with the female connector first a Fig. 23 View of male standard H5 connector. Code Key positions are shown in fig. 22. Note: High currents require a large crosssectional area of the connections to the female contacts. We recommend solder or screw terminal contacts. Each faston connection exhibits a resistance of max. 8 mω (typ. mω). Table 2: Pin allocation Pin HP HP HP HP Vo Output pos. Vo Output pos. Vo Output pos. Vo Output pos. Vo Output pos. Vo2 Output 2 pos. Vo2 Output 2 pos. Vo2 Output 2 pos. 8 Vo Output neg. Vo Output neg. Vo Output neg. Vo Output neg. Vo Output neg. Vo2 Output 2 neg. Vo2 Output 2 neg. Vo2 Output 2 neg. 2 S Sense 2 S Sense 2 S Sense 2 Vo Output pos. S Sense 2 S Sense 2 S Sense 2 Vo Output neg. R Adjust of V o R Adjust of V o R Adjust of V o R Adjust of V o/ T Current share T Current share 8 T Current share S2 Sense 2 2 Vo3 Output 3 pos. Vo3 Output 3 pos. n.c. Not connected S2 Sense 2 2 Vo3 Output 3 neg. Vo3 Output 3 neg. 22 OK Out OK OK Out OK OK Out OK OK Out OK 2 OK Out OK OK Out OK OK Out OK OK Out OK 2 Prot. earth PE Prot. earth PE Prot. earth PE Prot. earth PE 28 (i) 3 or inhibit (i) 3 or inhibit (i) 3 or inhibit (i) 3 or inhibit Input pos. Input pos. Input pos. Input pos. 32 Vi Input neg. Vi Input neg. Vi Input neg. Vi Input neg. Option T is available for singleoutput powertrains only. The Tfunction influences I o only. It is standard for singleoutput models. 2 Sense lines are only available for singleoutput powertrains. With doubleoutput power trains, these pins are not connected. 3 Pin 28 is the primary inhibit for models with options U or V. For other models it is the function. 8 Bel Power Solutions & Protection Page 2 of 27

25 92 W : DCDC Converters Installation Instructions These converters are components, intended exclusively for inclusion within other equipment by an industrial assembly process or by a professionally competent person. Installation must strictly follow the national safety regulations in respect of the enclosure, mounting, creepage distances, clearances, markings and segregation requirements of the enduse application. Connection to the system shall be made via the female connector H5 (see Accessories). Other installation methods may not meet the safety requirements. Check for hazardous voltages before altering any connections. Pin 2 (PE) is a leading pin and is reliably connected to the case. For safety reasons it is essential to connect this pin to the protective earth. No fuse is incorporated in the converter. An external circuit breaker or a fuse in the wiring to one or both input pins (no. and/ or no. 32) are necessary to ensure compliance with local requirements. Do not open the converters, or the warranty will be in validated. Make sure that there is sufficient airflow available for convection cooling. This should be verified by measuring the case temperature at the specified measuring point, when the converter is operated in the enduse application. T C max should not be exceeded. Ensure that a failure of the converter does not result in a hazardous condition. Standards and Approvals The HP Series converters are safetyapproved according to the latest edition of IEC/EN 95 and UL/CSA 95. They have been evaluated for: Class I equipment Building in Double or reinforced insulation based on 25 VAC or VDC between input and output and between input and auxiliary circuits Overvoltage category II Pollution degree 2 environment The converters fulfill the requirements of a fire enclosure. The converters are subject to manufacturing surveillance in accordance with the above mentioned UL standards and with ISO 9:5. Cleaning Liquids and Protection Degree The converters are not hermetically sealed. In order to avoid possible damage, any penetration of liquids shall be avoided. The converters correspond to protection degree IP, pro vided that the female connector is fitted to the converter. Railway Applications The HP Series converters have been designed observing the railway standards EN 555:7 and EN 5232:. All boards are coated with a protective lacquer. The converters fulfil the requirements of the fire safety standard EN 5552, hazard levels HL to HL3. Isolation The electric strength test is performed in the factory as routine test in accordance with EN 55 and IEC/EN 95 and should not be repeated in the field. The Company will not honor warranty claims resulting from incorrectly executed electric strength tests. Table 3: Isolation Characteristics Input to Outputs to Output to Out OK signals to Case Output Outputs Case Outputs Input Case Outputs Unit Electric strength test Factory test s / kvdc AC test voltage equivalent to factory test / kvac Insulation resistance > 2 > 2 > > > 2 > > MΩ Creepage distances / mm Pretest of subassemblies in accordance with IEC/EN 95 2 Tested at 5 VDC 3 Second value between outputs of the same powertrain 8 Bel Power Solutions & Protection Page 25 of 27

26 92 W : DCDC Converters Description of Options Option T: Active Current Sharing For singleoutput powertrains only. The currentshare function should be used, when several powertrains are operated in parallel. Examples could be high reliability n redundant systems or systems providing higher output power. Using this feature reduces the stress of individual converters and improves the reliability of the system. Interconnection of the currentsharing pins T causes the converters to share their output currents evenly. In redundant systems, the outputs of the converters have to be decoupled by ORing diodes. Consequently, a failure of one converter will not lead to a system failure. To ensure correct operation of the currentshare function, the installer must ensure that the S pins of all parallel converters are at the same electrical potential and that there are no voltage drops across the connecting lines between these pins. Doubleoutput converters with outputs connected in series can also be paralleled with current sharing, if pins Vo of all converters are connected together; see fig. 9. If the output voltages of parallel connected singleoutput converters are programmed to a voltage other than V o nom by means of the Rpin, the outputs should be adjusted in dividually within a tolerance of ±%. Note: The Tfunction in fluences V o only. Option U: Preadjusted Undervoltage Lockout UVL For compatibility with former P Series converters, the startup and the shutdown voltage are preadjusted depending on the nominal battery voltage. In addition, pin 28 (i) is used as inhibit; refer to the clause Primary Inhibit below. Table defines the startup and shutdown voltages. For the recommended fuses, refer to table 3. Option V: Rotary Switch to Adjust UVL Converters with option V allow for adjustment of the shutdown voltage by means of a position rotary switch, accessible through a hole in the case. In addition, pin 28 (i) is used as inhibit; refer to the clause Primary Inhibit below. Table defines the startup and shutdown voltages. For the recommended fuses, refer to table 3. The rotary switch is set in the factory to position D. Primary Inhibit for Option U and V This inhibit (pin 28) input enables (logic low) or disables (logic high or opencircuit) the output. In systems consisting of several converters, this feature may be used to control the activation sequence by logic signals or to enable the power source to start up, before full load is applied. The output response is shown in fig.. Note: If this function is not used, pin 28 must be connected with pin 32, otherwise the internal logic will disable the output. Table : UVL specification (typ.) for option U and V Table 5: Inhibit characteristics (models with option U or V) Battery Option U Position (Opt. V) V i min (on /off) 2 V U A.9 V 2.5 V 3 V U2 B 2.3 V 7 V 72 V 3 U2 C 3 V 3 V V U7 D 2 7 V 5 V for 2 s 2 factory setting 3 also for 9 V battery Characteristics Conditions min typ max Unit V inh I inh Inhibit Voltage Inhibit Current V o = on V i min V i max..8 V o = off T C min T C max 2. 5 V inh = V V inh = 5 V V inh = 5 V...2 C Option B, B, B3: Heat Sink The converter is fitted with an additional heat sink. Table : Thermal resistance of the case (approx. values) Case Thermal resistance Thickness of case Standard, mm long. K/W < mm Case, 2 mm long. K/W < mm Option B.5 K/W < mm Option B. K/W < mm Option B3.2 K/W < 5 mm Add 5 to the part number. 8 Bel Power Solutions & Protection Page 2 of 27

27 92 W : DCDC Converters Accessories A variety of electrical and mechanical accessories is available: Mating connectors including faston, screw, solder, or pressfit terminals; see Mating Connectors data sheet BCD.22. Front panels, system Schroff, for 9 racks in 3 U con figuration TE (GQ), 5 TE (G5Q), or TE (GQ). Similar panels system Intermas available. Front panels, system Schroff, for 9 racks in U con figuration 5 TE (G5HEQ) Mechanical mounting supports for chassis, DINrail, and PCB mounting plate Q (HZZ25G) with retention clips Q (HZZ229G) Connector retention brackets CRBQ (HZZ27G) Different cable connector housings (cable hoods) For additional accessory product information, see the accessory data sheets listed with each product series or individual model at our website. H5 female connector, code key system, faston, screw or other terminals Connector retention bracket HZZ27G Mounting plate Q for wall mounting (HZZ25G) with connector retention clips Q (HZZ229G) Universal mounting bracket for DINrail and chassis mounting (HZZG). Front panel kit G5HEQ (HZZ838) ac commodating two HP units for a 9 DINrack with U, 5 TE. NUCLEAR AND MEDICAL APPLICATIONS These products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. TECHNICAL REVISIONS The appearance of products, including safety agency certifications pictured on labels, may change depending on the date manufactured. Specifications are subject to change without notice. 8 Bel Power Solutions & Protection Page 27 of 27