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LMR16030 EN脚电阻分压问题

Other Parts Discussed in Thread: LMR16030

LMR16030设计输入电压7.4V-60V,输出电压5V。根据EN脚分压电阻公式设计如下:

Vstart=60V,Vstop=7.4V,Ihys=3.6uA,Ien=1uA

得出Rent=15M,Rent=240K.

问题现象:现供电12V,EN端电压400mV,低于阀值1.2V。

现在需要40V-60V电压能稳定输出5V,请问分店电阻应如何分配,劳烦各位指教,谢谢。