Need suggestions and help friends.. [Need help with LED driver]

[aswinram]

Hi everyone,


I am keen interested to design a LED driver but I dont know what and all things I have to know before starting to design it. Need some help. I need some links to refer and some ideas and suggestions about to design LED driver.

thanks..

 

[ArNvC]

What kind of led you are using?
Considering white led's you usually drive them with constant current to avoid violating the Absolute Maximum Current Rating and compromising the reliability and to obtain predictable and matched luminous intensity. you need some sort of voltage/current regulators. Like this one...

- - - Updated - - -

What kind of led you are using?
Considering white led's you usually drive them with constant current to avoid violating the Absolute Maximum Current Rating and compromising the reliability and to obtain predictable and matched luminous intensity. you need some sort of voltage/current regulators. Like this one...

 

[aswinram]

What kind of led you are using?
Considering white led's you usually drive them with constant current to avoid violating the Absolute Maximum Current Rating and compromising the reliability and to obtain predictable and matched luminous intensity. you need some sort of voltage/current regulators. Like this one...

- - - Updated - - -

What kind of led you are using?
Considering white led's you usually drive them with constant current to avoid violating the Absolute Maximum Current Rating and compromising the reliability and to obtain predictable and matched luminous intensity. you need some sort of voltage/current regulators. Like this one...

Thanks for your reply..

Just share your experience too if you tried like any kind of these things.. thanks again.

 

[ArNvC]

Few years back I made one using multiple white led's as shown in one of the schematics. Result was good. Then I tried with a nokia battery charger circuit to make a night lamp with 8 multicolor led's to be driven in parallel. This circuit is working well too. The charger output is 5VDC @ 800 mAh.

 

[aswinram]

Few years back I made one using multiple white led's as shown in one of the schematics. Result was good. Then I tried with a nokia battery charger circuit to make a night lamp with 8 multicolor led's to be driven in parallel. This circuit is working well too. The charger output is 5VDC @ 800 mAh.

Hi bro,

Thanks for sharing this...

I'm trying to drive a high power white LED's but the o/p current of the IC lm317l is 40mA but I need appox 300mA to 330mA. what I have to do in this to get that o/p current..


Thanks.

 

[ArNvC]

LT3437, LM2937. LM2937 would be good. I googled for it and found a link which uses the same to drive white LED's.

https://www.ehow.com/how_7705186_diy-white-led-driver-circuits.html