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.

TPS54620 PWM LED 调光 ,出现震荡

Other Parts Discussed in Thread: DLP4500

我们仿照DLP4500 EVM的LED供电线路:

SW1开路的时候 TP54输出3.3V。

SW1合上的时候,根据PWM占空比 ,输出2.5~3.5V电压。

现在发现 合上SW1,再打开,TP54 输出严重纹波

请问大概是什么问题?