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App note: Hiccup-mode current limiting

Posted on Sunday, July 20th, 2014 in app notes by DP

ap_microsemi_an-8

This is fairly old but interesting over current protection using Hiccup-mode from Microsemi. PDF here.

Hiccup-mode is a method of operation in a power supply whose purpose is to protect the power supply from being damaged during an over-current fault condition. It also enables the power supply to restart when the fault is removed. There are other ways of protecting the power supply when it is over-loaded, such as the maximum current limiting or current foldback methods.
One of the problems resulting from over current is that excessive heat may be generated in power devices, especially MOSFET’s and Schottky diodes and the temperature of those devices may exceed their specified limits. A protection mechanism has to be used to prevent those power devices from being damaged.

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