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LDO NR管脚电容使用引起的自激问题。



产品使用TPS78601型号LDO,原理图附图片,当NR管脚电容使用0.1uF电容时,LDO输出电压纹波很大(>1V)处于自激状态,当去掉后LDO输出恢复正常。通过手册看到NR管脚电容只与参考电平噪声和输出电压建立时间相关,和LDO环路稳定性如何建立的联系,以至于这种联系如何引起LDO正反馈自激?希望专家予以指导,谢谢。