DC-DC转换器内置的上下MOS管,内阻Rdson怎么测试?谢谢!
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测上管:先选一个大电感(目的让电感纹波尽可能小),让芯片工作在最大占空比,然后测量电感电流,再根据Vin和SW的压差就可以得出MOS的压差,最后除以电感电流就是上管的导通阻抗
测下管: 同样大电感,让芯片工作在最小占空比,测SW节点在下管导通时电压,再除以电感电流即可得到下管阻抗