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Ucc256302 轻载输出正常,负载加到一定值,芯片关闭

你好

我参考PMP20795做了一个电源,轻载没有问题,缓加负载到设计值一般时,芯片关闭。三个过流保护,blk欠压过压保护均未到触发条件。不知是什么情况导致。