原理图是这样的,此处存在一定几率TPS79633不工作,导致此电路电压本应为3.3V,实为2.8V。
大部分板子表现完全正常,个别有这个情况,但去掉负载后79633输出正常。
出现故障时,用表笔碰一下VOUT或L6左端,经过一段抖动后输出恢复正常。
请大牛帮分析下内在机理。
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