TPS43060在工作一段时间后,无法输出48V的设计电压值,用示波器测量VCC-PIN,发现无法保持7.5V,当我再在外部接入一个5V到VCC-PIN时,又可以稳定输出48V。所以我怀疑是外围电路设计不合理或layout不合理导致VCC-PIN损坏。附图为我的原理图和PCBlayout,请帮我解决这个问题,产品已经量产,不良率高达百分之15
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如果你的LDO也容易损坏,建议你换成TPS43061试一下,我现在就是换成了TPS43061,验证100PCS不良率为0。当然,外部自举二极管要NC,VCC滤波电容4.7uF就够了。