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
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Hi
将R89/R90去掉。
另外你确认一下芯片GND的电压: 电压表测试负极接输入电压源的GND, 正极测芯片GND, 低边MOS的GND, 看是否也是负压?
Hi
建议你参考: https://e2echina.ti.com/support/power-management/f/power-management-forum/803284/tps92641-mos
以波形为准,电压表测试不准,因为负压开关瞬间产生的。
Hi
同时我将关闭这个case, 在上述: https://e2echina.ti.com/support/power-management/f/power-management-forum/803284/tps92641-mos 中回复。