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LM5170: LM5170 调好以后, 输出的电流漂移会慢慢想上爬升

Part Number: LM5170


LM5170 芯片焊接好后,按照IT推荐的电路,供电10v, 输入48v,  

 发指令可以控制输出电压和电流。

但是有一个问题, 输出电压为12V, 设定输出电流是6A 

连续测试1~2个小时,输出电流会,慢慢的升到6.07 A, 上升了60 毫安。这个是哪几方面引起的?