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BQ40Z50-R1: 输出电压会跳变,每隔3秒电压掉一下,不能充电

Part Number: BQ40Z50-R1


用万用表测试Pack输出电压,输出电压会在7~9V跳变,用示波器检测输出电压波形,发现每隔3秒电压会掉一下,推测主回路MOS一直在做开关动作,充电也充不了,跪求哪位大神帮解答一下。