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LM3409 PWM 调光问题

Other Parts Discussed in Thread: LM3409

请问我用LM3409 采用PWM调光,现在用1.5KHz 频率PWM,灯光为50W的大功率LED,现在PWM为16位的PWM,调整占空比的时候,光线变化不是线性的,在开始光变强的时候会跳变。

请问是否是我的PWM频率太低了的原因?还是电路参数没有算好?