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TPS92641: TPS92641芯片HG与LG负压问题

Part Number: TPS92641

用示波器测试到芯片HG与LG脚负压很大,HG负压最低值到-10.8V,LG负压最低值到-8.8V,怎么能减小这个负压值   CH1:下边mos管Vds,CH2:芯片HG脚波形,CH3;芯片LG脚波形