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TPS61196 电感啸叫

Other Parts Discussed in Thread: TPS61196

各位好,

                 目前使用TPS61196使用12V升压到21V,但是当PWM(500HZ)调整亮度时(较亮时)发现电感会有啸叫声音出现,请问电路上可以怎么抑制吗?

还是需要修改电感数值?有更换不同型式的电感,但啸叫声依旧会有,谢谢