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TPS54340输出电压与公式不符

Other Parts Discussed in Thread: TPS54340

本人用TPS54340做了个降压电源 ,输入电压12V  Rfbb为10K,Rfbt用100K滑动变阻器,按照芯片datasheet公式 ,输出应该是0.8~8V左右可调的  但是我的输出最多只能到5.2V,不知为何。其他参数变动不大,电路是可以带负载的!