Automatic_shutdown_for_load_shorts

Published:2009/7/24 4:05:00 Author:Jessie | From:SeekIC

This circuit latches down the main regulator if a short occurs in the load. When power is applied, the auxiliary output comes up and transfers the charge through the capacitor. This forces the enable pin high, and allows the main regulator to come up and power the load. If a load short occurs, the regulator goes into current limit and the main output falls to zero. This pulls the enable pin low and completes a positive-feedback latch to disable the main output. Under these conditions, the output remains at zero-even after the load short is removed. Thus, the regulator need not dissipate power during the short. The output can be reset by removing the regulator input power (VIN) or by forcing the enable pin.



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