For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit.
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1 Current Transducer CAS 25-NP/SP2 N = 25 A For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between the primary and the secondary circuit. Features Closed loop (compensated) multi-range current transducer Voltage output Single supply Insulating plastic case material recognized according to UL 94-V Compact design for PCB mounting. Special feature Configuration with 3 primary conductors positioned to meet higher insulation distance. Advantages Very low temperature coefficient of offset Very good dv/dt immunity LTS compatible footprint Reduced height. Applications AC variable speed and servo motor drives Static converters for DC motor drives Battery supplied applications Uninterruptible Power Supplies (UPS) Switched Mode Power Supplies (SMPS) Power supplies for welding applications. Standards EN 5178: 1997 UL 58: 21 IEC 611-1: 21 IEC : 21. Application Domain Industrial. N 97.E Page 1/11
2 Absolute maximum ratings CAS 25-NP/SP2 Parameter Symbol Unit Value Supply voltage U C V 7 Primary conductor temperature T B C 11 Maximum primary current max A 2 N ESD rating, Human Body Model (HBM) U ESD kv 4 Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may degrade reliability. UL 58:Ratings and assumptions of certification File # E Volume: 2 Section: 1 Standards CSA C22.2 NO INDUSTRIAL CONTROL EQUIPMENT - Edition 11 - Revision Date 211/8/1 UL 58 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Edition 17 - Revision Date 21/4/15. Parameter Symbol Unit Value Primary involved potential V AC/DC 6 Max surrounding air temperature T A C 85 Primary current A to 25 Secondary supply voltage U C V DC 7 Output voltage V to 5 Conditions of acceptability When installed in the end-use equiment, consideration shall be given to the following: 1 - These devices must be mounted in a suitable end-use enclosure. 2 - The terminals have not been evaluated for field wiring. 3 - CAS series shall be used in a pollution degree 2 environment. 4 - Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a transformer,optical isolator,limiting impedance or electro-mechanical relay) and having no direct connection back to the primary circuit (other than through the grounding means). Marking Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL s Follow-Up Service.Always look for the Mark on the product. Page 2/11
3 Insulation coordination Parameter Symbol Unit Value Comment RMS voltage for AC insulation test 5/6 Hz/1 min U d kv 4.2 Impulse withstand voltage 1.2/5 µs Û W kv 7.6 Partial discharge extinction rms 1 pc U e V 1 Clearance (pri. - sec.) d CI mm 8.2 Creepage distance (pri. - sec.) d Cp mm 8.2 Creepage distance (pri..- sec.) d Cp mm 11 Shortest internal distance through air (Note 1) ) Shortest internal path along device body (Note 1) ) Shortest external path along device body Case material - - V according to UL 94 Comparative tracking index CTI 6 Application example - - Application example - - Note: 1) Inside device enclosure providing protection IP5x. Environmental and mechanical characteristics 1 V CAT ID2 6 V CAT IID2 Reinforced insulation, non uniform field according to IEC Basic insulation, non uniform field according to EN 5178, EN 611 Parameter Symbol Unit Min Typ Max Comment Ambient operating temperature T A C Ambient storage temperature T S C Mass m g 9 Page 3/11
4 Electrical data At T A = 25 C, U C = +5 V, N P = 1 turn, R L, unless otherwise noted. Parameter Symbol Unit Min Typ Max Comment Primary nominal rms current N A 25 Primary current, measuring range M A Number of primary turns N P - 1,2,3 Supply voltage U C V I Current consumption I C ma 15 + P (ma) I 2 + P (ma) N S = 1731 turns Output voltage V Output = A V 2.5 Electrical offset voltage V OE mv % tested V N S N S Electrical offset current referred to primary I OE A % tested Temperature coefficient = A TC ppm/k ±6.5 ±6 ppm/k of 2.5 V -4 C.. 85 C Theoretical sensitivity G th mv/a mv / N Sensitivity error ε G % % tested Temperature coefficient of G TCG ppm/k ±4-4 C.. 85 C Linearity error ε L % of N Magnetic offset current (1 N ) referred to primary Output noise current spectral density 1 Hz.. 1 khz referred to primary Peak-peak output ripple at oscillator frequency f = 45 khz (typ.) I OM A i no µa/hz ½ 15 R L - mv 1 4 R L Reaction time to 1 % of N t ra µs.3 R L di/dt = 68 A/µs Step response time to 9 % of N t r µs.3 R L di/dt = 68 A/µs Frequency bandwidth (±1 db) BW khz 2 R L Frequency bandwidth (±3 db) BW khz 3 R L Overall accuracy X G % of N 1.8 Overall T A = 85 C X G % of N 3.5 Accuracy X % of N.8 T A = 85 C X % of N 2.5 Page 4/11
5 Typical performance characteristics Linearity error (% of N ) (A) Figure 1: Linearity error Relative Sensitivity (db) Relative Sensitivity Phase Frequency (Hz) Figure 2: Frequency response = 25 A Phase ( ) (A) = 25 A (V) (A) = 25 A (V) Figure 3: Step response t (µs) Figure 4: Step response t (µs) i no (μa/hz ½ ) E E E E E E E + 7 Frequency (Hz) Figure 5: Input referred noise Primary Voltage V P (V) kv/μs V P t (µs) Figure 6: dv/dt (V) Page 5/11
6 Maximum continuous DC primary current I (A) P (A) T A T( C) A ( C) Figure 7: vs T A The maximum continuous DC primary current plot shows the boundary of the area for which all the following conditions are true: -- < M -- Junction temperature T j <125 C -- Primary conductor temperature <11 C -- Resistor power dissipation <.5 rated power Frequency derating AC Derating 1.25 max rms AC current / max DC current k 1k 1k 1M f (Hz) Figure 8: Maximum RMS AC primary current / maximum DC primary current vs frequency Page 6/11
7 Performance parameters definition Ampere-turns and amperes The transducer is sensitive to the primary current linkage Θ P (also called ampere-turns). Θ P = N P (At) Where N P is the number of primary turn (depending on the connection of the primary jumpers) Caution: As most applications will use the transducer with only one single primary turn (N P = 1), much of this datasheet is written in terms of primary current instead of current linkages. However, the ampere-turns (A-t) unit is used to emphasis that current linkages are intended and applicable. Transducer simplified model The static model of the transducer at temperature T A is: = G Θ P + error In which error = V OE + V OT (T A ) + ε G Θ P G + ε L (Θ Pmax ) Θ Pmax G + TCG (T A - 25) Θ P G With: Θ P = N P :the input ampere-turns (At) Please read above warning. Θ P max :the maxi input ampere-turns that have been applied to the transducer (At) :the secondary voltage (V) T A :the ambient temperature ( C) V OE :the electrical offset voltage (V) V OT (T A ) :the temperature variation of V O at temperature T A (V) G :the sensitivity of the transducer (V/At) ε G :the sensitivity error ε L (Θ Pmax ) :the linearity error for Θ Pmax This model is valid for primary ampere-turns Θ P between -Θ Pmax and +Θ Pmax only. Sensitivity and linearity To measure sensitivity and linearity, the primary current (DC) is cycled from to, then to - and back to (equally spaced /1 steps). The sensitivity G is defined as the slope of the linear regression line for a cycle between ±N. The linearity error ε L is the maximum positive or negative difference between the measured points and the linear regression line, expressed in % of N. Magnetic offset The magnetic offset current I OM is the consequence of a current on the primary side ( memory effect of the transducer s ferro-magnetic parts). It is included in the linearity figure but can be measured individually. It is measured using the following primary current cycle. I OM depends on the current value 1. A Figure 9: (DC) 1-1 I OM V t ) V 2 ( ( t ) OUT 1 OUT 2 = (t 1 ) - (t 2 ) t 1 1 Gth Current cycle used to measure magnetic and electrical offset (transducer supplied) t 2 t Page 7/11
8 Performance parameters definition (continued) CAS 25-NP/SP2 Electrical offset The electrical offset voltage V OE can either be measured when the ferro-magnetic parts of the transducer are: completely demagnetized, which is difficult to realize, or in a known magnetization state, like in the current cycle shown in figure 9. Response and reaction times The response time t r and the reaction time t ra are shown in figure 1. Both depend on the primary current di/dt. They are measured at nominal ampere-turns. I Using the current cycle shown in figure 3, the electrical offset is: (t ( t ( t OUT 1 ) + V OUT out (t 2 2 ) V OE = 2 The temperature variation V OT of the electrical offset voltage V OE is the variation of the electrical offset from 25 C to the considered temperature: 1 % 9 % I p 1 % t r V out V OT (T) = V OE (T) - V OE (25 C) Note: the transducer has to be demagnetized prior to the application of the current cycle (for example with a demagnetization tunnel). t ra Figure 1: Response time t r and reaction time t ra t Overall accuracy The overall accuracy at 25 C X G is the error in the -N.. +N range, relative to the rated value N. It includes: the electrical offset V OE the sensitivity error ε G the linearity error ε L (to N ) The magnetic offset is part of the overall accuracy. It is taken into account in the linearity error figure provided the transducer has not been magnetized by a current higher than N. R M Figure 11: Test connection U C Page 8/11
9 Filtering and decoupling Supply voltage U C Application information Output The fluxgate oscillator draws current pulses of up to 3 ma at a rate of ca. 9 khz. Significant 9 khz voltage ripple on V C can indicate a power supply with high impedance. At these frequencies the power supply rejection ratio is low, and the ripple may appear on the transducer output and reference V ref. The transducer has internal decoupling capacitors, but in the case of a power supply with high impedance, it is advised to provide local decoupling (1 nf or more, located close to the transducer). The output has a very low output impedance of typically 2 Ohms; it can drive 1 pf directly. Adding series R f = 1 Ohms allows much larger capacitive loads. Empirical evaluation may be necessary to obtain optimum results. The minimum load resistance on is 1 kohm. Total Primary Resistance The primary resistance is.72 mω per conductor In the following table, examples of primary resistance according to the number of primary turns. R M U C Number of primary turns Primary resistance R P [ mw ] Recommended connections OUT IN OUT IN OUT IN Page 9/11
10 CAS 25-NP/SP2, PCB footprint Assembly on PCB Recommended PCB hole diameter 1.3 mm for primary pin.8 mm for secondary pin Maximum PCB thickness 2.4 mm Wave soldering profile maximum 26 C for 1 s No clean process only. Safety This transducer must be used in limited-energy secondary circuits according to IEC This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements in accordance with the manufacturer s operating instructions. Caution, risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a build-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used. Main supply must be able to be disconnected. Page 1/11
11 Dimensions CAS 25-NP/SP2 (in mm. General linear tolerance ±.25 mm) d Cl d Cp Connection R M U C R M d Cl d Cp Page 11/11
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