Typical Application Circuit of UC3842 Overvoltage and Overcurrent Protection

Published:2011/6/7 0:08:00 Author:Michel | Keyword: Overvoltage and Overcurrent Protection, Typical Application Circuit | From:SeekIC

The typical application circuit of UC3842 overvoltage and overcurrent protection picture is showed as above. Overcurrent Protection Principle When load current exceeds rating value or the output shorts,which causes that current is added to switch tube V4 ,R7's voltage feedbacks to feet.When R7's voltage exceeds 1V and the conduction width narrows down cuased by inside current amplifier and the output voltage drops,meanwhile it makes the UC3842 work's voltage drop.When it is lower thansetting voltage,over-current protection circuit starts to work to protect power tube.Power supply resumes work when short circuit phenomenon vanishes.



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