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TPS7A4901输出电压不受控制



如图所示的,降压电路,解法是TI推荐的典型接法,(5v接有10uf电容,图中未显示)
PCB焊接上元件后,输入引脚电压都正常,FB引脚电压也正常1.18v,
但是out输出只有1.65v,测过2个电阻,阻值正常,调节滑变没有效果