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TPS54302应用时出现的问题

示波器图形中,黄色波形为3.3V,蓝色波形为VBAT。

VBAT 空载时,3.3V每180ms有一个毛刺。

VBAT带载是(约500mA)3.3V稳不住,电压升高,可以从示波器截图中看到,受到到VBAT纹波影响。

去掉C8(68pF)3.3V不受VBAT负载变动的影响,但是纹波过大,大约为130mV,请问哪里出问题了,该如何解决?

注:3.3V一直处于空载状态,另外+12也会受到Vbat负载阶跃的影响,电压波动在1~2V左右