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TPS92691 升压驱动LED 功率不够

Other Parts Discussed in Thread: TPS92691

请问下 我用TPS92691 升压驱动20W 的LED(33V 600mA)。

PWM 一直使能、IADJ 电压 2.3V

驱动电路图如下:

现在遇到以下问题

1、 LED 电流只有270mA

2、 GATE开启和关闭瞬间 震荡严重

3、GATA 开启后的稳定状态 IS电压只有240mV左右 不到520mV