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TOP254PN Datasheet(PDF) 23 Page - Power Integrations, Inc. |
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TOP254PN Datasheet(HTML) 23 Page - Power Integrations, Inc. |
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23 / 48 page  Rev. F 01/09 23 TOP252-262 www.powerint.com A High Efficiency, 20 W continuous – 80 W Peak, Universal Input Power Supply The circuit shown in Figure 43 takes advantage of several of TOPSwitch-HX features to reduce system cost and power supply size and to improve power supply efficiency while delivering significant peak power for a short duration. This design delivers continuous 20 W and peak 80 W at 32 V from an 90 VAC to 264 VAC input. A nominal efficiency of 82% at full load is achieved using TOP258MN. The M-package part has an optimized current limit to enable design of power supplies capable of delivering high power for a short duration. Resistor R12 sets the current limit of the part. Resistors R11 and R14 provide line feed forward information that reduces the current limit with increasing DC bus voltage, thereby maintaining a constant overload power level with increasing line voltage. Resistors R1 and R2 implement the line undervoltage and over- voltage function and also provide feed forward compensation for reducing line frequency ripple at the output. The overvoltage feature inhibits TOPSwitch-HX switching during a line surge extending the high voltage withstand to 700 V without device damage. The snubber circuit comprising of VR7, R17, R25, C5 and D2 limits the maximum drain voltage and dissipates energy stored in the leakage inductance of transformer T1. This clamp configuration maximizes energy efficiency by preventing C5 from discharging below the value of VR7 during the lower frequency operating modes of TOPSwitch-HX. Resistor R25 damps high frequency ringing for reduced EMI. A combined output overvoltage and over power protection circuit is provided via the latching shutdown feature of TOPSwitch-HX and R20, C9, R22 and VR5. Should the bias winding output voltage across C13 rise due to output overload or an open loop fault (opto coupler failure), then VR5 conducts triggering the latching shutdown. To prevent false triggering due to short duration overload, a delay is provided by R20, R22 and C9. To reset the supply following a latching shutdown, the V pin must fall below the reset threshold. To prevent the long reset delay associated with the input capacitor discharging, a fast AC reset circuit is used. The AC input is rectified and filtered by D13 and C30. While the AC supply is present, Q3 is on and Q1 is off, allowing normal device operation. However when AC is removed, Q1 pulls down the V pin and resets the latch. The supply will then return to normal operation when AC is again applied. Transistor Q2 provides an additional lower UV threshold to the level programmed via R1, R2 and the V pin. At low input AC voltage, Q2 turns off, allowing the X pin to float and thereby disabling switching. A simple feedback circuit automatically regulates the output voltage. Zener VR3 sets the output voltage together with the voltage drop across series resistor R8, which sets the DC gain of the circuit. Resistors R10 and C28 provide a phase boost to improve loop bandwidth. Diodes D6 and D7 are low-loss Schottky rectifiers, and capacitor C20 is the output filter capacitor. Inductor L3 is a common mode choke to limit radiated EMI when long output cables are used and the output return is connected to safety earth ground. Example applications where this occurs include PC peripherals, such as inkjet printers. C8 1 nF 250 VAC D6-D7 C9 1 F 100 V R17 1k 0.5 W VR7 BZY97C150 150 V T1 D2 FR107 D13 1N4007 F1 3.15 A C30 100 nF 400 V Q3 2N3904 R23 1M C1 220 nF 275 VAC 90 - 264 VAC R24 1M L1 5.3 mH 68 k D10 1N4007 C3 120 F 400 V R11 3.6 M D8 1N4007 RT1 10 R1 2M R14 3.6 M D9 1N4007 Q2 2N3904 R18 39 k Q1 2N3904 R2 2M R3 2M R15 1k R21 1M 0.125 W R4 2M R26 C S D V X R22 2 M C6 100 nF 50 V U4 TOP258MN C7 47 F 16 V VR5 1N5250B 20 V R25 C5 10 nF 1kV R6 6.8 C10 1nF 250 VAC EF25 R20 130 k D5 LL4148 C13 10 F 50 V U2A PC817D R9 2k R8 1.5 k R10 56 VR3 1N5255B 28 V C28 330 nF 50 V R19 68 0.5 W STPS3150 C26 100 pF 1 kV L3 47 H L2 3.3 H C31 22 F 50 V C20 330 F 50 V R12 7.5 k 1% D11 1N4007 100 CONTROL C29 220 nF 50 V t o 32 V 625 mA, 2.5 A PK RTN PI-4833-092007 1 9 10 5 2 3 4 NC TOPSwitch-HX Figure 43. 20 W Continuous, 80 W Peak, Universal Input Power Supply using TOP258MN. |
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