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TPS61169: TPS61169使用?

Part Number: TPS61169

在使用TPS61169,原来的背光电流需要120mA,电阻只接了1.6R,PWM频率设置的18.7K,亮度调到最大时,Vbf测量204mV,现在背光电流最大需要260mA,电阻1.6R,有并联了一个1.3R的电阻,亮度调到最大时,但是测量Vbf只有约136mV,也就是背光亮度只能到190mA左右