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TPS61165-Q1: IC 开关频率波形异常

Part Number: TPS61165-Q1
Other Parts Discussed in Thread: TPS61165

TI all!

    TPS61165作为LCD的背光IC,售后机器出现黑屏现象,检查外部正常情况下,IC SW脚开关频率波形出现异常,如下图,

为什么会出现开关频率波形异常呢?烦请TI专家们指出下问题。

原理图设计为: