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tps55340输出电压降低

Other Parts Discussed in Thread: TPS55340

tps55340芯片不接负载输出正常12v,但是加负载后输出降低为7.4v,FB引脚电压正常时为1.2v,接负载后变为0.8v,找不到头绪,请问有什么因素会影响输出