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UCC28600 VCC锯齿波

Other Parts Discussed in Thread: UCC28600

你好,我用UCC28600做准谐振反激。输入为400-600V dc。现在讲母线电压经过1M电阻接至VCC,芯片VCC电压一直在8-13.1V震荡。无驱动信号输出。请问这是为什么?VCC对地电容10u。