Circuit provides hiccup-current limiting


Posted on May 7, 2012

The three major types of current-limit-protection mechanisms are constant, foldback, and hiccup. Hiccup current limit performs the best of the three types; however, the implementation is rather complex. In this scheme, upon detection of an overcurrent event, the whole power supply shuts down for an interval before it tries to power itself up again. The cycle repeats until the overcurrent fault disappears.



Note that, according to the 2N2222A data sheet, dc current gain can be 75 to 300. Therefore, to obtain a better prediction from the above equation, it is advisable to determine the dc gain through simple testing.




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