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tps92691驱动LED占空比调光问题

使用TPS92691-Q1做LED驱动芯片,调试中,发现GATE的输出频率和占空比跟PWM脚保持一致,PWM频率7.2K,占空比5%就最亮了,DDRV引脚波形跟pwm一样,占空比10%就LED就闪烁,闪烁时Vis电压会变大闪烁,DDRV波形也跟PWM一样,不知道哪里出现了问题,可否加QQ:390568627详细帮忙解答