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LED Driver Recommendation

Drew Doran
Prodigy 240 points
Other Parts Discussed in Thread: TPS92515

Hi,

I was wondering if you could recommend which LED Driver I should use for the following design parameters:

- 12-60VDC input

- 20VDC output

- LED drive current 380mA

- Analog dimming down to 1%

- fewest parts, lowest cost

Thank you!

Regards,

Drew

  • 0
    TI__Mastermind 25500 points

    Hello Drew,

    We have chips that can do that for sure, but that is a very wide input voltage range. You could run into min duty cycle issues when dimming at high Vin unless the switching frequency is relatively low (harder to reach 1%). You would also need a buck-boost topology which increases complexity in some cases. Or would a two stage be possible? 

    Feel free to contact me directly if you would like to discuss possibilities and tradeoffs. We can do it for sure but such a versatile application will not be extremely low component count, but not necessarily expensive in the end.

    Regards,

    Clint

  • 0 in reply to Clinton Jensen
    TI__Prodigy 240 points
    Hi Clint,

    Thanks for getting back to me so quickly! I forwarded your response to my customer and here is what he had to say:

    "We do not need buck-boost, we are envisioning buck only. Sorry for the confusion, the input voltage will always be higher than the 20V OLED voltage. We do want a part that handles at least 60VDC input voltage.

    Please let me know what TI parts might be best candidates for this and getting as close to 1% dimming as feasible."

    Any ideas on what part can do this?

    Thanks!

    Regards,
    Drew
  • 0 in reply to Drew Doran
    TI__Mastermind 25500 points

    Hello Drew,

    Yes, the TPS92515 would be a good choice. If designed so that you do not reach minimum OFF time too early you can get below 1%. There is an EVM available as well as some TI Designs using this part.

    Regards,

    Clint