Inductorless, Dual Output Off-Line Regulators

Transcription

1 Inductless, Dual Output Off-Line Regulats Features Accepts peak input voltages up to 700V Operates directly off of rectified VAC Integrated linear regulat Minimal power dissipation No high voltage capacits required No transfmers inducts required Up to 1.0W output power Applications 5.0V power supplies SMPS house keeping power supplies White goods Appliances Small off-line low voltage power supplies Lighting controls General Description The Supertex is an inductless, dual output off-line controller providing up to 1.0W of output power. It does not require any transfmers, inducts, high voltage input capacits. The input voltage, HV IN, is designed to operate from an unfiltered full wave rectified 120V 230V AC line. It is designed to control an external N-channel MOSFET IGBT. When HV IN is less than 45V, the external transist is turned-on, allowing it to charge an external capacit connected to V SOURCE. An unregulated DC voltage will develop on V SOURCE. Once HV IN is above 45V, the transist is turned off. The maximum gate voltage f the external transist is 24V. The unregulated voltage is approximately 1V. The also provides a regulated 5.0V. WARNING! Galvanic isolation is not provided. Dangerous voltages are present when connected to the AC line. It is the responsibility of the designer to assure adequate safeguards are in place to protect the end user from Typical Application Circuit 470μF ~1V Unregulated Gate 120VAC 230VAC HV IN V SOURCE V OUT V OUT = 5.0V Regulated

2 Ordering Infmation Device -Lead MSOP 3.00x3.00mm body 1.10mm height (max) 0.65mm pitch -Lead SOIC w/ Heat Slug 4.90x3.90mm body 1.70mm height (max) 1.27mm pitch MG-G SG-G -G indicates package is RoHS compliant ( Green ) Pin Configuration N/C N/C Lead MSOP (MG) GATE SOURCE N/C 1 GATE N/C 2 7 SOURCE N/C 3 6 Absolute Maximum Ratings Parameter Value V IN, High voltage input +700V V OUT, Low voltage output Stage temperature Soldering temperature Power dissipation, -Lead MSOP +6.0V -65 O C to +150 O C +300 O C 300mW Power dissipation, -Lead SOIC 1.5W 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. 1. When underside plate soldered to 2cm 2 of exposed copper. 4 5 N/C Heat Slug -Lead SOIC w/ Heat Slug (SG) (top view) Make NO electrical connections to backside plate! Product Marking Top Marking S037 LLLL Bottom Marking YYWW YYWW L L L L L = Lot Number YY = Year Sealed WW = Week Sealed = Green Packaging -Lead MSOP (MG) YY = Year Sealed WW = Week Sealed L = Lot Number = Green Packaging -Lead SOIC w/ Heat Slug (SG) Electrical Specifications (Over operating supply voltages unless otherwise noted, T A = 0 C to +125 C) Sym Parameter Min Typ Max Units Conditions HV IN Peak transient voltage Input voltage V Peak rectified AC voltage V TH HV IN voltage when Gate is pulled to ground V --- V GS Gate to Source clamp voltage ±10 ±15 ±20 V I GS = ±100µA V GATE Gate to ground clamp voltage V --- V OUT Regulated output voltage f the -Lead SOIC V V SOURCE = 10V ΔV OUT V OUT load regulation mv V SOURCE = 10V, I LOAD = 0 to 50mA 1 Freq Input AC frequency Hz Load current on the regulated output must not cause power dissipation to exceed max ratings. Wst case power dissipation is given by: P V 2 IN + (16V - V OUT ) I OUT 15kΩ Where I OUT is the load on the regulated output. 2

3 Typical Perfmance Curves 25 Gate Clamp 60 HV IN (off) Vgate (V) H V I N (V ) Temperature ( C) Temperature ( C) 6 Regulat Output 20 Gate Voltage V O U T (V ) V G at e (V ) Source Voltage (V) HV IN (V) HV Input Current 125 C 25 C -40 C Load Regulation I I N (µ A ) V O U T (V ) Source=15V 25 C Source=V 25 C HV IN (V) I OUT (ma) 3

4 Application Infmation Operating Principle The operates by controlling the conduction angle of the external MOSFET as shown in Figure 1. When the rectified AC voltage is below the V TH threshold, the pass transist is turned on. The pass transist is turned off when the rectified AC is above HV IN(OFF). Output voltage ( ) decays during the periods when the switch is off and when the rectified AC is below the output voltage. The amount of decay is determined by the load and the value of C1. Since the switch only conducts with low voltages across it, power dissipation is minimized. Functional Block Diagram Gate Source V REF CM Reg Figure 1. Typical Wavefms Switch ON HV IN V TH V REG not to scale Power dissipation Power dissipation in the is from 2 sources. The first is due to the bias current ( overhead) required to operate the device. This may be calculated from P BIAS = V IN2 /15kΩ, where V IN is the input voltage in V RMS. The second source of power dissipation is the 3.3V linear regulat and may be calculated from P REG = (16V - V OUT ) * I REG, where V OUT is 3.3V, and I REG is the load current on the 3.3V output. The total power dissipated by the is the sum of these two: P BIAS + P REG. (These equations are conservative actual dissipation may be less.) To adequately dissipate the power, the underside plate of the SG should be soldered to at least 2.0cm 2 of exposed copper area on the PCB. Power is also dissipated by the pass transist. Power dissipated by the transist will be (16V * I TOTAL ) * (1/Eff -1) where I TOTAL is the sum of the load currents on the regulated and unregulated outputs and Eff is the converter efficiency (0.30 to be conservative). The transist should be soldered to at least 5.0cm 2 of exposed copper area on the PCB f heatsinking. Transfmers AC Line Do not use a transfmer - either fixed variable - on the AC line. The inductance of the transfmer interferes with the nmal operation of the. 4

5 Using a MOSFET in Place Of an IGBT VN F 270F ~1V Unregulated 120VAC 230VAC Gate VSOURCE 1.0F SR036: V OUT =3.3V Regulated Efficiency 50 VN2460, no EMI, no EMI Efficiency (%) VN2460, w/emi, w/emi Efficiency and EMI Test Circuit P UNREG (W) 120/230VAC 50/60Hz P6KE 400CA EMI Suppress C G 220pF 220μF (VN2460) 470μF () R G 10kΩ V IN GATE SOURCE V REG C REG V REG 5

6 Circuit Using VN2460 (with EMI Supression Circuit) 120VAC/60Hz - Limits per 47CFR f Class B devices. 45mA total load. Hot Neutral A ver ag e Quasi-peak 20VAC/60Hz (230VAC/50Hz not available) - Limits per CISPR 14-1 f household appliances. 23mA total load. Hot Neutral A v erag e Quasi-peak 6

7 Circuit Using (no EMI Supress) 120VAC/60Hz - Limits per 47CFR f Class B devices. 50mA total load. Hot Neutral 20VAC/60Hz - (230VAC/50Hz not available). Limits per CISPR 14-1 f household appliances. 25mA total load. Hot Neutral A verage Quasi-pea k A verage Quasi-pea k 7

8 Circuit Using (no EMI Supress) 120VAC/60Hz - Limits per 47CFR f Class B devices. 100mA total load. Hot Neutral A verage Quasi-pea k

9 Application Infmation (cont.) 120VA C 230VA C 1KΩ Gate Source 220μF V REG ON/OFF TN2106K1 Figure 2: Example Circuit with Enable Control Figure 2 is an example circuit using the along with a Supertex IGBT to generate an unregulated voltage of approximately 1V and a regulated voltage of 3.3V. The combined total output current is typically 50mA. The TN2106K1 in series with a 1.0KΩ resist can be added f applications requiring an enable control. 120VAC 230VAC Gate Source 220μF 10KΩ Vz 5.6V 2N MΩ V OUT1 = 5.0V V OUT2 = 3.3V Figure 3: Generating Two Regulated Voltages F applications requiring two regulated voltages, an inexpensive discrete linear regulat can be added to regulate the unregulated output as show in Figure 3. The discrete linear regulat consists of a Zener diode, a resist and a bipolar transist. The regulated voltage, V OUT 1, is determined by the Zener diode voltage minus the base-to-emitter voltage drop of 0.6V. Figure 3 uses a 5.6V Zener diode to obtain a 5.0V output. Different Zener diode voltages can be used to obtain different regulated output voltages. Unregulated Voltage 120VAC 230VAC Gate Source 5.0V 220μF Logic Control Circuit 1N4001 1KΩ 2N Ω 5V Coil Relay Figure 5: Driving 5V Relay Coils The circuit shown in Figure 4 uses the to supply a regulated 3.3V f the logic control circuitry, while the unregulated voltage is used to drive a 12V relay coil. The operating voltage f a 12V relay coil is typically very wide and can therefe operate directly from the unregulated line. 9

10 Application Infmation (cont.) Unregulated Voltage 120VAC 230VAC Gate Source 5.0V 220μF Logic Control Circuit V Z 5.1V 5V Coil Relay Figure 5: Driving 5V Relay Coils with Zener Diode Clamp The circuit shown in Figure 5 uses the to drive 12 high efficiency red LEDs from an AC line. The average LED current is approximately 20mA. Unregulated Voltage 120VAC 230VAC Gate Source 220μF V REG 330Ω 330Ω Figure 6: Driving LEDs from 120VAC The circuit shown in Figure 5 uses the to drive 12 high efficiency red LEDs from an AC line. The average LED current is approximately 20mA. 10

11 Application Infmation (cont.) AC line Figure 7: Precision Current Drive f LED String from AC Line Features: 1. Precision Current Regulat 2. Zener Voltage Boost 3. PWM Dimming (optional) 4. EMI Filter (optional) Notes: 10K Zener Voltage Boost Supertex GATE Vz = V Z + 14V = V LED + V EMI Filter (optional) SOURCE 1. The circuit uses the and to drive a string of LEDs from AC power line. 2. The LED current is regulated at up to 40mA. 3. The LED string voltage can be up to AC line voltage (120V f 120VAC / 230V f 230VAC). 220pF 10K + 47μF PWM Dimming (optional) R = / 1.5mA TL431 R - +V Rs Constant Current Regulat I LED = 2.5V / R S < 40mA + V LED +2.5V I LED = V LED + V < V Z + 16V R = / 1.0mA AC line Figure : Simple Current Drive f LED String from AC Line Features: 1. Simple Current Regulat 2. Automatic Voltage Boost 3. Zener Boost Voltage Limit (optional) 4. EMI Filter (optional) Notes: 10K 220pF Gate Supertex Vz EMI Filter (optional) SOURCE Zener Boost Voltage Limit (optional) 1. The circuit uses the and to drive a string of LEDs from AC power line. 2. The LED current is regulated at up to 40mA. 3. The LED string voltage can be up to AC line voltage (120V f 120VAC / 230V f 230VAC). +100μF R + V BE - 220nF + V LED Simple Current Regulat I LED = V BE / R S < 40mA - 100k I LED R S 11

12 -Lead MSOP Package Outline (MG) 3.00x3.00mm body, 1.10mm height (max), 0.65mm pitch D θ1 (x4) E E1 Note 1 (Index Area D/2 x E1/2) L2 Gauge Plane 1 L1 L θ Seating Plane A Top View View B View B A A2 A A1 e Side View b Seating Plane View A-A Note: 1. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier; an embedded metal marker; a printed indicat. Symbol A A1 A2 b D E E1 e L L1 L2 θ θ1 Dimension (mm) MIN 0.75* * 4.65* 2.0* O 5 O NOM BSC REF BSC - - MAX * 5.15* 3.20* 0.0 O 15 O JEDEC Registration MO-17, Variation AA, Issue E, Dec * This dimension is not specified in the iginal JEDEC drawing. The value listed is f reference only. Drawings are not to scale. Supertex Doc. #: DSPD-MSOPMG, Version G

13 A -Lead SOIC (Narrow Body w/heat Slug) Package Outline (SG) 4.90x3.90mm body, 1.70mm height (max), 1.27mm pitch D D1 Exposed Thermal Pad Zone Note 1 (Index Area D/2 x E1/2) E1 E E2 1 Top View 1 Bottom View View B θ1 h A A2 Seating Plane h Note 1 L2 Gauge Plane A1 e b L L1 θ Seating Plane A Side View View A - A View B Notes: 1. If optional chamfer feature is not present, a Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/ identifier; an embedded metal marker; a printed indicat. Symbol A A1 A2 b D D1 E E1 E2 e h L L1 L2 θ θ1 Dimension (mm) MIN 1.25* * * 3.0* O 5 O NOM BSC REF BSC MAX * * * 4.00* O 15 O JEDEC Registration MS-012, Variation BA, Issue E, Sept * This dimension is not specified in the iginal JEDEC drawing. The value listed is f reference only. This dimension is a non-jedec dimension. Drawings not to scale. Supertex Doc. #: DSPD-SOSG, Version C (The package drawing(s) in this data sheet may not reflect the most current specifications. F the latest package outline infmation go to Supertex inc. does not recommend the use of its products in life suppt applications, and will not knowingly sell them f use in such applications unless it receives an adequate product liability indemnification insurance agreement. Supertex inc. does not assume responsibility f use of devices described, and limits its liability to the replacement of the devices determined defective due to wkmanship. No responsibility is assumed f possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. F the latest product specifications refer to the Supertex inc. website: http// 200 All rights reserved. Unauthized use reproduction is prohibited. Doc.# DSFP- A Bdeaux Drive, Sunnyvale, CA 9409 Tel: