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LMR16030在后级充电芯片给锂电池充电时温度迅速升高!

Other Parts Discussed in Thread: LMR16030

使用LMR16030实现12V-5V,在没有插入锂电池充电时,LMR16030能够正常工作,输出5V,电源纹波等正常;当插入锂电池,后级充电电路工作时,LMR16030温度迅速上升至手摸很烫立马缩回的程度。测量锂电池能够正常充电,以下是原理图及PCB,希望各位大神帮忙分析温升问题,万分感谢!

12V转5V电路如图:

充电芯片电路如下:

PCB为4层板,内层有大量的地,这里省略

TOP层:

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