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4.7 Momentary Overload or Short Circuit Protection

In case of an overload or a short circuit event, the voltage across the sense resistor would increase

beyond 220 mV. This would then activate the short circuit current limit and limit the switching frequency by

a factor of 8 while the event exists. In case of a prolonged overload/short circuit event, the large currents

would cause the junction temperatures of the MOSFET and the diode to increase significantly and

potentially cause thermal failure.

AN-2094 LM3481 SEPIC Evaluation Board SNVA461A–September 2011–Revised April 2013

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