Part Number: LM27762
目标是搭建±2.5v电源,电路图如下,out-输出正常,为2.49v,而out+输出为3.90v。
测量各个引脚电平,结果如下:
VIN=4.92v
CP=-4.76v
OUT-=-2.49v
FB-=-1.22v
OUT+=3.90v
FB+=1.84v
另外,我将VIN降低到4.08v,此时OUT-输出依然为-2.49v,但OUT+输出降低到2.98v,似乎LDO没有正常工作。
附上PCB图如下:
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