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LMR14050S带载电压下降很厉害

Other Parts Discussed in Thread: TPS54200, TPS54201

你好

      我用LMR14050S设计的电路,空载的时候输出电压都是对的,6V 。我负载接了一个6V 10W的灯,灯的亮度很弱,测量电压就2.1V。过十几秒之后电压上升到3.7V,再过十几分钟后上升为5.3V,请问这是哪里出了问题。