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求助TPS61169驱动LED相关问题

Other Parts Discussed in Thread: TPS61169, TPS62150, LM3410

1、使用TPS61169驱动1个LED,输入电压3.8V,要求输出电流25MA至500MA可调,目前电流在200至600MA区间内可调,电流降不下来,求解问题出在哪里!LED额定3V/350MA;

2、使用TPS61169驱动4个串联LED,输入电压3.8V,要求输出电流25MA至500MA可调;目前电流在20MA至180MA区间内可调,电压在13V-14V,芯片发热厉害,求解问题出在哪里!LED额定3V/350MA;

两个方案中二极管均选用1N5819,Rset电阻选用0.33R,PWM频率在10K和100K之间均测试过

以上要求若TPS61169不能满足要求,求推荐可满足要求IC