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LED Driver Circuit Design

Tyrique Townsend
Prodigy 60 points
Other Parts Discussed in Thread: TPS92633-Q1, TPS92623-Q1

3 sting

12-18V INPUT   

Sting 1= 18V 80mA

Sting 2 = 18V 80mA

Sting 3 = 16.8V 10mA

Individual PWM control OR I2C

Fault Detection

 

For our application, we will need to drive 2 stings of LEDs at 18v 87mA, and a single string of LEDs at 16.8V 10mA.   We will not be driving stings (1,2) at the same time as 3   (STING 1-2 ON/STING 3 OFF) (STING 1-2 OFF/STING 3 ON)

 

We have 18V or 12V available to power Driver.    

 

Do you have an LED driver that could work/is recommended for our application?

  • 0
    TI__Expert 4970 points

    Hi Tyrique, 

    This seems like a perfect application for the TPS92633-Q1. It has everything that you need and more:

    • AEC-Q100 qualified for automotive applications:
    – Temperature grade 1: –40°C to 125°C, TA
    • Wide input voltage range: 4.5 V to 40 V
    • Thermal sharing by external shunt resistor
    • Low supply current in fault mode
    • Three high-precision current regulation:
    – Up to 150-mA current output for each channel
    – ±5% accuracy over full temperature range
    – Independent current setting by resistor
    – Independent PWM pin for brightness control
    – Support off-board brightness binning resistor
    – Support external NTC for current derating
    • Low dropout voltage:
    – Maximum dropout: 600 mV at 150 mA
    • Diagnostics and protection
    – LED open-circuit with auto-recovery
    – LED short-to-GND with auto-recovery
    – Single LED short-circuit detection with autorecovery
    – Diagnostic enable with adjustable threshold
    – Fault bus configurable as either one-fails–all-fail
    or only-failed-channel off (N-1)
    – Thermal shutdown
    • Operation junction temperature range: –40°C to 150C

    If these is more features than needed I would also recommend the TPS92623-Q1. Both are linear drivers that can be handled by individual PWM inputs and should meet your current, voltage, and diagnostic requirements without a problem.

    Best,

    Pedro Arango Ramirez.