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LM3466 IC 实际运用过程中温升问题

Other Parts Discussed in Thread: LM3466

Ti工程师你们好:

     最近有使用LM3466,但是测试温度一致不正常,如下图:

   

 发现第2个IC的问题最高,包括设计4个模组的灯具,也是第2个模组的IC温度最高,比其他IC的温度差20度

想问下是什么原因?