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LM317的输入输出压差最大是多少?

Other Parts Discussed in Thread: LM317

LM317的输入输出压差最大是多少?

手册上说是40V,但我输入24VDC,想输出3.3VDC时,电路不能正常工作,输出降到2.2V,Vref也只有0.8V

我将输入电压改为15V时,则工作正常。输入电压改为12V时也工作正常!