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用TPS61193芯片做LED背光驱动 升压问题

Other Parts Discussed in Thread: TPS61193

用TPS61193做的LED背光驱动芯片  现在遇到这样一个问题  希望能帮忙解答一下

1、上电瞬间,电压升压到了10.4V和计算的差不多;

2、但是过一会儿电压就逐渐减低到了5V