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TPSM53603电压输出故障

Other Parts Discussed in Thread: TPSM53603

输入电压15V,TPSM53603设定电压输出5V,实际输出电压只有1.9V,FB上手册的电压是1V,实际测量FB电压只有0.3V,这是芯片坏了吗?