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LM2903: 输出问题

Part Number: LM2903

使用示波器测试时出现问题,正常情况正端电压高,输出正12V,负端电压高,输出正常负5V,目前问题,负端电压高时,输出的负5V电压到50毫秒时,会突然跳转到正12V,停留5毫秒左右,恢复为负5V。