TPS92515: Running multiple parallel LED strings

Nicholas Burczyk60

Prodigy 130 points

Part Number: TPS92515

Hi,

I am designing a board variants one with 4 LEDs on one string and one with 8 LED on 2 parallel strings.

Considering maxV and maxI are within spec are there any negatives to doing this?

Regards

Nick

over 7 years ago

0 Clinton Jensen over 7 years ago

TI__Mastermind 25500 points

Hello Nicholas,

Paralleling LED strings is not uncommon. The only thing is to try and match the forward voltage of the two strings as close as possible so they share current as well as possible. If all of the LEDs are the same device it usually works well. If there is concern about some mismatch you can always add a little series resistance with each string, but that usually isn't necessary.

Regards,

Clint

0 Nicholas Burczyk60 over 7 years ago in reply to Clinton Jensen

Prodigy 130 points

Thanks a lot Clint.

Regards,
Nick

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TPS92515: Running multiple parallel LED strings