输入AC105V，输出设置DC170V，带载100W，工作正常。断开负载再接上负载，ucc28019就没输出了，电压输出只有147V。28019外观也无损伤，请教下大侠，为什么会损坏28019？MOS没坏。以下是带载时候的电流及DS波形
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