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发表于 2025-7-24 13:16:00
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本帖最后由 andy2000a 于 2025-7-24 13:17 编辑
vb : start up
if no vref , vref < vth , nmos gate =hi ..and vb =low
when power on vb low , start up bandgap
and when vref > vth
control vb nmos gate=low , nmos drian = vb will floating
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