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TPS2376H输出不正常,只有5V,不知道为什么

Other Parts Discussed in Thread: TPS2376HEVM, TPS2376

如图中电路,采用的RJ45加网络变压器加TPS2376H供电,但是插入网线后VDD端的输出电压为5V,VSS引脚为-45V,RTN引脚接地,电路无电流输出。后将RILIM由1M改为330K后,电路能输出电流但输出到DC上的电压还是只有5V。将RILIM由330K改为10K后VDD输出电压在5V-50V之间跳变,且网络变压器出现较大的电流声,求问此芯片为什么会出现这种问题,是不是还有匹配电阻或者电容没设置正确。