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关于TPS40210的问题

Other Parts Discussed in Thread: TPS40210

电路是按照tps40210芯片手册上焊的,只是把270nf换成了330nf,,86.6千欧换成了100千欧,25毫欧换成了50毫欧,6.04欧换成了6.2欧,1.54千欧换成了1.5千欧,MOS管是用的irf540的,只是输入12V的电压,输出还是12V,这是为什么啊