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LP8861输出异常关断,导致间歇性黑屏或一直黑屏。

Part Number: LP8861

常温工作情况下,示波器监测EN信号、12V供电和PWM信号都正常,输出LED+电压从28V直线下降到22V左右,然后缓慢下降到12V。此时FB管脚电压1.4V左右,使用万用表测量FB管脚,故障会消失,输出电压恢复正常,FB管脚电压1.2V。故障反馈脚没有拉低。

故障出现后有时会自己恢复正常输出电压。有时会一直保持12V输出。

故障概率10%