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LM5117: lm5117搭配TPS23731负载功率不够

Part Number: LM5117
Other Parts Discussed in Thread: TPS40210, TPS23731,

我们使用TPS23731(PD)+TPS40210升压为52V+LM5117降压为5V的整套PD方案

 1. 单独使用TPS23731 输出功率正常可以到20W

2. 单独使用LM5117 USB 12V输入 输出5V/3A正常

3. 如果外接48V电源模块给LM5117供电,系统也能够工作

4. 如果使用TPS40210升压到52V给LM5117供电,输出就异常了。

请帮忙分析下可能是哪个芯片出现问题了