输出短路时时开关频率Fold back

[123mybox]

Datasheet上看到短路时频率fold back可以防止过流点跑飞，请问是什么原理？感谢。The frequency fold-back comparator lowers the oscillator frequency
when the FB voltage is below 660mV to prevent current limit runaway during a short-circuit fault condition.

[Fay.He]

您好！当短路发生时，电感电流会快速上升至限流保护点而触发短路保护动作，降频意味着降功率，可以有效降低电感电流过冲过高。