This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS53355调试问题求助

Other Parts Discussed in Thread: TPS53355

使用TPS53355芯片实现5V转换为1.3V,15A实验时,采用FCCM模式,空载和1A载时输出正常,当输出电流大于2A时,输出电压跌落!经检查发现不是测量误差导致。气开关节点波形的占空比变小了,且随负载增大占空比不断减小。

输出电压跌落时查看PGOOD脚仍旧高电平,没有触发欠压保护;尽管输出电压随负载增大而跌落,查看VFB引脚的电压一直为0.6V,此时将Ripple injection接到VFB的电容取下,输出电压值正常,但系统会产生震荡。

想请问是什么原因,和解决方法!谢谢各位了。