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LP8864-Q1: 芯片的应用问题

Part Number: LP8864-Q1

我们测试了下OUT1boostout/GD波形如下:其中在背光5%OUT1GD波形对于不上

1、背光95%最亮时波形:

2、背光5%最暗时波形:

原理图如下

请帮忙看看有什么问题并且怎么解决?