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TPS23750输出没有12V,是19V,怎么解决?

Other Parts Discussed in Thread: TPS23750

做了一个样板,用TPS23750 为主控芯片,目标是输出12V 1A,可是,焊接好,输出是19V,空载,什么原因?初次做电源,请教问题,谢谢!