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TPS92641输出纹波大,开关频率乱

Other Parts Discussed in Thread: TPS92641

使用TPS92641驱动单颗LED(用于DLP照明,投影一直抖动),12V输入,6V 5A输出,测试输出电压有很大的纹波,纹波频率和供给IADJ引脚上PWM频率一致,测试SW引脚上的频率一直在变化,电感出现啸叫,由于纹波过大,VOUT引脚上的电压也超过过压保护门限,想知道引起纹波的原因?有什么方法可以解决?谢谢。

输出波形

开关频率SW( PIN15)波形

VOUT(PIN4波形)