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急!急!急 !tps54340没有输出电压

Other Parts Discussed in Thread: TPS54340

求助 TPS54340没有输出电压

输入电压  24V~36V   电流 2A

输出电压  21V    电流2A

Pic  是接电流表的   Pda是接一个单片机上的DAC的