TPS2375D输出不稳定

TPS2375D在使用时出现输出电压不稳定，一直在跳，后端加负载后才稳定，求解？

Wu JW：

PD标准中有最小功率限制，需要>10mA以上的负载。TPS2375的MPS功能（MAINTAIN POWER SIGNATURE）就是为了满足这个要求的。

user5129062：

回复 Wu JW:

“Once a valid PD has been detected and powered, the PSE uses the maintain power signature (MPS) to
determine when to remove power from the PI. The PSE removes power from that output port if it detects loss of
MPS for 300 ms or more. A valid MPS requires the PD to draw at least 10 mA and also have an ac impedance
less than 26.25 kΩ in parallel with 0.05 μF. TI's reference designs meet the requirements necessary to maintain
power”这个要求吗？还要求26.25kOHM和0.05uF什么意思？

Johnsin Tao：

回复 user5129062:

Hi是需要加负载的，没有负载怎么分配功率？

user5129062：

回复 Johnsin Tao:

“Once a valid PD has been detected and powered, the PSE uses the maintain power signature (MPS) todetermine when to remove power from the PI. The PSE removes power from that output port if it detects loss ofMPS for 300 ms or more. A valid MPS requires the PD to draw at least 10 mA and also have an ac impedanceless than 26.25 kΩ in parallel with 0.05 μF. TI's reference designs meet the requirements necessary to maintainpower”要求26.25kOHM和0.05uF什么意思？需要怎么处理吗？

Wu JW：

回复 user5129062:

这两个值，26.25kohm是DET电阻，电容就是输入电容，你只需要按我们的芯片要求设计就可以了。