design 4A led driver for automotive application

Thread Starter


Joined Aug 15, 2014

I am designing high power led lamp for vehicles using this led.
led datasheet

this led has If up to 6A and Vf is around 3 V, I am going to use it at 4A for longer life.
My input voltage source is car battery so voltage range is 12V - 16 V

I am hoping to connect two leds in series. since it is high power led, I hope to use buck converter type led driver ic.

However I failed to find a ic which support my voltage range and 4A current, in TI ic list I found 1.25A ic but it is not enough for me.

I do not need pwm dimming option so no need complex chips. I am looking for simple switching type converter schematic or ic suggestion. if anyone know a ic for this application please help me.

Thank you