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LT1640AHIS8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1640AHIS8 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT1640AL/LT1640AH Under some conditions, a short circuit at the output can cause the input supply to dip below the UV threshold, resetting the circuit breaker immediately. The LT1640A then cycles on and off repeatedly until the short is removed. This can be minimized by adding a deglitching delay to the UV pin with a capacitor from UV to VEE. This capacitor forms an RC time constant with the resistors at UV, allowing the input supply to recover before the UV pin resets the circuit breaker. A circuit that automatically resets the circuit breaker after a current fault is shown in Figure 9. Transistors Q2 and Q3 along with R7, R8, C4 and D1 form a programmable one-shot circuit. Before a short occurs, the GATE pin is pulled high and Q3 is turned on, pulling node 2 to VEE. Resistor R8 turns off Q2. When a short occurs, the GATE pin is pulled low and Q3 turns off. Node 2 starts to charge C4 and Q2 turns on, pulling the UV pin low and resetting the circuit breaker. As soon as C4 is fully charged, R8 turns off Q2, UV goes high and the GATE starts to ramp up. Q3 turns back on and quickly pulls node 2 back to VEE. Diode D1 clamps node 3 one diode drop below VEE. The duty cycle is set to 10% to prevent Q1 from overheating. VEE VDD LT1640AL PWRGD SENSE C1 150nF 25V C4 1 µF 100V C3 100 µF 100V Q1 IRF530 R2 10 Ω 5% R8 510k 5% R3 18k 5% C2 3.3nF 100V R4 562k 1% R7 1M 5% R5 9.09k 1% R6 10k 1% Q3 ZVN3310 Q2 2N2222 D1 1N4148 R1 0.02 Ω 5% 4 3 2 OV – 48V UV 56 8 7 1 GATE DRAIN 1640A F09a 3 2 + GND GND (SHORT PIN) * * DIODES INC. SMAT70A 4 3 2 1 Figure 9. Automatic Restart After Current Fault 1640A F09b APPLICATIO S I FOR ATIO |
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