使用TPS5450DDA,12V输入-5V输出,5V负载(ldo,lcd背光升压芯片,485芯片);设计输出3A,目前测试电流800ma左右,使用过程中5V输出突然掉电。蓝色为5V输出,绿色为电流。
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Hi
在输入没有变化时输出拉低? 先没有输出然后再启动有异常大电流,可以通过电子负载确认电路是否重现这个异常?