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帮忙看下tps54160电源板子带大负载时输出电压下降的问题

Other Parts Discussed in Thread: TPS2384, TPS54160

用TPS2384的芯片做了一批dc-dc板子,打样测试时接小功率负载测试没问题,就批量做了。

现在接上12瓦左右的负载就带不起来了,输出电压降到4.7v了,请论坛的高手帮忙看下这个板子还有办法补救吗?

看了datasheet,电源芯片GND大焊盘需要打孔接到bottom层,我的pcb板子芯片中间的GND面积是否小了一些,而且没有打孔

可能散热不太好,现在的情况还有办法补救吗?

 

1.输入电压范围24-40v,输出电压12v 1.5A

2.原理图:

3.PCB文件