Overcurrent latch circuit composed of the M51958B

Published:2011/8/25 20:29:00 Author:TaoXi | Keyword: Overcurrent, latch circuit | From:SeekIC

The overcurrent latch circuit is composed of the M51958B. Because the power supply is the multi-output power, if anyone of the channels is in the overcurrent protection state, the voltage will decrease, the optocoupler TLP521 cuts off, the side control PWM integrated circuit stops working, the power supply is protected. This circuit controls all of the PWM integrated circuits, and it has the overvoltage protection locking terminal. The R1-R5 are the dividing resistors, the set voltage of the midpoints is higher than the pin-2 peak voltage of the M51958B (10%-20%). The R1 and C2 decide the start time constant of the circuit, R6 is the dark current resistance of the TLP521 that can be used to prevent the optocoupler error action.



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