Dear,
用TPS23753A做PD端POE方案,调试过程中发现POE供电的检测、PD端设备分类、开始供电都已经有了,但开始供电冲到48V后马上电压会下来。过程中TPS23753A会发烫,但示波器地接TPS23753A的第六脚(RTN)后TPS23753A不烫了。示波器量TPS23753A的第二脚(VB)无电压,请帮忙分析,谢谢!
附原理图。
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Dear,
用TPS23753A做PD端POE方案,调试过程中发现POE供电的检测、PD端设备分类、开始供电都已经有了,但开始供电冲到48V后马上电压会下来。过程中TPS23753A会发烫,但示波器地接TPS23753A的第六脚(RTN)后TPS23753A不烫了。示波器量TPS23753A的第二脚(VB)无电压,请帮忙分析,谢谢!
附原理图。
Dear Johnsin,
请帮忙看下问题如何解决,谢谢。
b/r
vincent