Hello everybody.I have been trying to find the best solution for me for a while but i am confused a little bit.
The goal it to make a custom led light for my car's tail light.I am gonna drive 3 x 1w power leds in series (about 300-320 ma at 9 VDC) or i might try to wire 3 x 3w power leds in serial (about 900 ma at 9 VDC).First i look for lm 317 ic but then i figured it out that i need a constant cureent.Without it leds are gonna heat too much and it means lower lifetime.LM317 does not limit current i think.So i look for some constant current led driver ics like NCV7691 etc.But i am confused to decide.So i wanted to ask you about it.
Which way would be the best to limit led voltage and current for my specs?
It might not be any ic if there are more options i am open more ideas.
The board should be about 13 mm x 40 mm. (0.51 inches x 1.57 inches) should put the circuit on this size of board.
Thank you.
The goal it to make a custom led light for my car's tail light.I am gonna drive 3 x 1w power leds in series (about 300-320 ma at 9 VDC) or i might try to wire 3 x 3w power leds in serial (about 900 ma at 9 VDC).First i look for lm 317 ic but then i figured it out that i need a constant cureent.Without it leds are gonna heat too much and it means lower lifetime.LM317 does not limit current i think.So i look for some constant current led driver ics like NCV7691 etc.But i am confused to decide.So i wanted to ask you about it.
Which way would be the best to limit led voltage and current for my specs?
It might not be any ic if there are more options i am open more ideas.
The board should be about 13 mm x 40 mm. (0.51 inches x 1.57 inches) should put the circuit on this size of board.
Thank you.