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TPS23752调试问题咨询

Other Parts Discussed in Thread: TPS23752

最近调试TPS23752遇到点问题,原理设计如附件SCHEMATIC1 _ 03-PD+DCDC.pdf

1、VFO模式输出异常,变压器异响,

2、强制PWM模式可正常输出(开关频率为240K左右,Vc=10V,Vb=5V,VCTL=1.8V)。

3、测量上电PD检测和分级的波形如下图(VSS异常)