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TPS61165 电路啸叫问题

Other Parts Discussed in Thread: TPS61165

各位老大好!

我用TPS61165驱动照明LED,输入DC12V,输出14.5V(LED压降1.6V×9PCS,9串2并),最大电流250mA,通过PWM信号控制CTRL调节亮度。PWM频率5KHz。

出现啸叫现象:测量输出波形发现输出文波大。

调试发现:1、PWM频率大于30KHz有明显改善;

2、用DC5V输入有明显改善;

3、输出端增加滤波电容,无明显改善;

4、电感改为22UH无明显改善;

请问是什么原因导致?在不改变PWM频率和输入电压的情况下,可通过什么方法改善该问题?

谢谢!

原路图如下: