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tps23750非隔离型没有输出

Other Parts Discussed in Thread: TPS23750

采用tps23750做了个电源板,用DC(30v)供电输入,没有输出;用示波器测量mos管的三个管脚都跟供电端一样的电平,用POE供电供电,也没有输出,情况跟DC供电一样,而且FB、COMP也是跟输入端一样的情况。