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TPS54232 and TPS62110, LED driver application

Other Parts Discussed in Thread: TPS62110, TPS54232

 

I am doing a lighting system which power source is solar panel, 17V and i need a DC/DC used a LED driver to drive 4xwhite LEDs in series (LED voltage is 3.2V). I intend to use TPS54232 and TPS62110(low iq) to drive the LED. I need dimming control, so can i use PWM signal at EN pin for dimming control?