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LM2842M典型应用问题

Other Parts Discussed in Thread: LM2842

按数据手册典型应用电路应用,12V输入,设计5V输出,实际输出1.2V,Vcb=Vin,请帮助看看是哪儿问题,谢谢!

示波器查看SW,无正常启动波形,直流信号1.2V。