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LM317M 电路完全参考datasheet的应用设计,但是输出不能稳压,输出电压不断随着输入电压变化,请帮忙确认是什么问题,谢谢

Other Parts Discussed in Thread: LM317M

您好,我们在设计LCD屏背光驱动板时,选用了LM317M 作为LDO, 从DC20V 输入转 DC3.3V 输出(负载电流80mA)。LM317M  的电路设计 完全参考datasheet的应用设计,但是输出不能稳压,输出电压不断随着输入电压变化,不能稳压。已基本排队器件及焊接异常,但仍查找不到原因,请帮忙确认是什么问题,谢谢