themaccabee
Full Member level 4
Hi ,
I need to develop a LCD module back light drvier circuit, Its a string of LEDs and the datasheet says we need to take care of temperature derating.
Can some body help me to get a starting circuit?
Ive only 5V supply onboard.
I suppose i need to do a 19.2V boost converter.
Then i need a constant current source circuitry to maintain the current through the string at < 15mA
Shall i need to take care of any protection like failing one LED (open or short?) in the series string?
And how to make the current temperature independent or compensate it?
Thanks & Regards
**broken link removed**
Uploaded with ImageShack.us
I need to develop a LCD module back light drvier circuit, Its a string of LEDs and the datasheet says we need to take care of temperature derating.
Can some body help me to get a starting circuit?
Ive only 5V supply onboard.
I suppose i need to do a 19.2V boost converter.
Then i need a constant current source circuitry to maintain the current through the string at < 15mA
Shall i need to take care of any protection like failing one LED (open or short?) in the series string?
And how to make the current temperature independent or compensate it?
Thanks & Regards
**broken link removed**
Uploaded with ImageShack.us