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请教一下LDO温度问题

Other Parts Discussed in Thread: TPS62560

我用LP3878_ADJ,VIN=5.0V,VOUT=1.0V,负载300MA左右, 芯片温度非常高,芯片底部已有大面积覆铜上锡散热,目前连续工作几天是没出问题,但是很担心芯片会挂掉