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TPS55340发热问题



我这是一个锂电池升压为DC24V的电路,正常情况下,输入电压在3.0V以上的到时候,输出是正常的,我的负载电流约是300mA。但是当输入电压在3.0V以下的时候,就发热严重了,包括芯片,电感,肖特基二极管都发了严重,手都不敢摸。

电路图如下所示: