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LM5121: LM5121MH/NOPB工作异常,VCC输出7.5V左右,SS脚没有电压输出一直低于1.2V,没有PWM输出

Part Number: LM5121

LM5121MH/NOPB工作异常,VCC输出7.5V左右,SS脚没有电压输出一直低于1.2V,没有PWM输出