Ucc28740驱动脉冲一直为低，Vdd电容正常充放电，有什么原因会让Vdd处接地电容有充放电过程，而驱动脉冲却一直没有出现呢？原本电路正常工作的，自从拆下28740再装上去后，驱动脉冲就再也出不来了，换了新的芯片也没用，一模一样的电路参数重新焊一块也没用。
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