LED driver help

orien walker

Prodigy 145 points

Other Parts Discussed in Thread: TPS92512, TPS92515, LM3401

Attemptign to drive A single LED at 2A with a 6V DC supply. suggestions or directions on which driver i should use?

over 9 years ago

0 Clinton Jensen over 9 years ago

TI__Mastermind 25500 points

A good integrated FET solution that would work very well for this is the TPS92512 or the TPS92515. Which depends on your application really. If you need really fast PWM dimming or wide range analog dimming for example the 515 would be better. If you need constant switching frequency and/or do not need wide range or high frequency dimming the 512 may be better.

0 orien walker over 9 years ago in reply to Clinton Jensen

Prodigy 145 points

Would the LM3401 work or is that the wrong direction? checked out the 515 and it looks promising as well.

0 Clinton Jensen over 9 years ago in reply to orien walker

TI__Mastermind 25500 points

All 3 I mentioned would work just fine. Some considerations:

-LM3401: Hysteretic so it is very fast regarding any transients and has fast PWM dimming (up to 10's of kHz if needed). It has no dedicated analog dimming function. This is the most simple of the 3.

-TPS92515: Also hysteretic so fast, plus it has wide range analog dimming.

-TPS92512: Current mode control so it is very accurate and has a constant switching frequency, but also slower for PWM dimming (up to 1kHz max for decent range). It also has analog dimming, but the range is limited if Vin is within about 5V or less of Vout.

Really none of them are the wrong direction. It just depends on whether or not you need certain features for which you use.

0 Clinton Jensen over 9 years ago in reply to Clinton Jensen

TI__Mastermind 25500 points

www.digikey.com is a good place to find PFETs

0 orien walker over 9 years ago in reply to Clinton Jensen

Prodigy 145 points

when you say pfet you mean p channel mosfet correct?

0 Clinton Jensen over 9 years ago in reply to orien walker

TI__Mastermind 25500 points

That is correct.

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LED driver help