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tps61197问题

Other Parts Discussed in Thread: TPS61197

用tps61197设计LED驱动板,上电测试,无法升压,用示波器测量GDRV脚,没有波形,同时REF和comp pin没有电压,

VDD电压有输出且正常吗,请问是怎么回事。

驱动板.pdf