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tps61165 CTRL引脚控制问题

电路参考规格书中的参考电路飞线设计;

CTRL引脚直连可调电源3.3V,芯片正常工作;CTRL引脚直连或者接限流电阻至DC-DC电源模块输出的3.3V,连接屏的背光就变得特别暗。

请问这是什么原因?