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LED driver for variable length automotive general purpose light

Alex Walters
Prodigy 10 points
Other Parts Discussed in Thread: TPS92690, LM3423, LM3429, LM3421, LM3424

Hi, 

I'm working on a project which requires a high brightness LED driver for a general purpose light which will go into trucks and vans.  V IN range would be 8-32V DC, with 13.5 V being typical.  It needs PWM dimming control.  I would like to run the LEDs at 350mA. typical LED forward voltage would be 3.3V, but worst case would be 3.5V.  The number of LEDs would be configurable by adding LED boards that would have 4 LEDs each.  the min number of LEDs would be 4 or maybe 8, the max would be 36.  The arrangement, or number of series /parallel LEDS, is not defined yet.

It would be nice to not have to change anything (like a sense resistor, or a jumper setting) on the driver pcb when a LED board was added or taken away.

such a wide V IN range with such a wide possible number of LEDS has led me to the experts..   :-)

What would you recommend for a driver chip and LED arrangement?

Thanks for your input.

  • 0
    Prodigy 20 points

    Alex Walters said:

    Hi, 

    I'm working on a project which requires a high brightness LED driver for a general purpose light which will go into trucks and vans.  V IN range would be 8-32V DC, with 13.5 V being typical.  It needs PWM dimming control.  I would like to run the LEDs at 350mA. typical LED forward voltage would be 3.3V, but worst case would be 3.5V.  The number of LEDs would be configurable by adding LED boards that would have 4 LEDs each.  the min number of LEDs would be 4 or maybe 8, the max would be 36.  The arrangement, or number of series /parallel LEDS, is not defined yet.

    It would be nice to not have to change anything (like a sense resistor, or a jumper setting) on the driver pcb when a LED board was added or taken away.

    such a wide V IN range with such a wide possible number of LEDS has led me to the experts..   :-)

    What would you recommend for a driver chip and LED arrangement?

    Thanks for your input.

    Maybe this link can help you:

    www.ti.com/.../spry156.pdf

  • 0 in reply to jing wei
    TI__Expert 3920 points

    Hi Alex,

    Please consider LM3421, LM3423, LM3424, LM3429 and TPS92690 for automotive LED headlight applications.

    This series of devices having PWM dimming input can be configured into boost, boost-to-battery (aka buck-boost) or SEPIC which fits for your end equipment requirements.

    Thank you!

    Issac Hsu

    Worldwide Marketing Engineer

    Lighting Power Products

    Texas Instruments