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参考TIDA-01558给LMR14020 FB加了一个高端电流采样的运放做限流,环路不稳定

Other Parts Discussed in Thread: LMR14020

参考如下原理图,自己打的板子和官方给的Gerber文件打出的板都不行,刚开始的时候都是ok的,每过两三个小时lmr14020输出就变得不稳定,出现斩波波形。请问各位专家,这个参考设计有什么需要注意的地方么?

祝好!