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UCC256301驱动电压波形事宜,瞬间带载保护

电源设计输出47V/10A,在轻载的时候,下管的驱动波形与VCR管脚的电压波形如图,驱动频率高-低-高地变化,在突然带载的时候,VCR的电压波形过大而导致输出没有,然后再恢复,是什么原因呢?