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根据DRV2700EVM-HV500资料画板,没有500v输出

Other Parts Discussed in Thread: DRV2700EVM-HV500

根据DRV2700EVM-HV500资料画板 ,现在只在hv输入端测到1.4v左右的电压。用示波器检测到sw的信号如图“sw信号”。哪里出问题了?请大神指路