Precision PWM Dimming LED Driver Reference Design for Automotive Lighting
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Key Document


The TIDA-01183 TI Design details a solution on how to use pulse width modulation (PWM) to dim an automotive headlight or tail light with a precision of better than 2% duty cycle without the necessity of using a micro controller. This allows the design to be very cost competitive. Devices used in this design are the TPS92691-Q1 multi-topology LED Driver in boost and boost to battery configuration controlling the LEDs.  The TLC555-Q1 LinCMOS timer, together with the OPA2377-Q1 operational amplifier, measure and generate an accurate PWM signal by applying a feedback loop and a precision shunt regulator for setting the duty cycle accurately. The designs input stage is EMI/EMC filtered and can be directly supplied by the cars battery.

  • Precisioin PWM dimming
  • Efficiency-optimized design
  • Operation through cold crank
  • Load dump tolerant

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA2377-Q1  Automotive-Qualified, Rail-to-Rail In/Out, Low Noise, 5MHz CMOS Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TL431-Q1  Automotive adjustable precision shunt regulator (pin layout: KRA)  Voltage references  Sample & Buy Not Available
TPS92691-Q1  Automotive multi-topology LED driver with rail-to-rail current sense amplifier  LED drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA2377-Q1 Download
TL431-Q1 Download
TPS92691-Q1 Download Download

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User guide (1)
Title Type Size (KB) Date
PDF 3158 12 Jan 2017
Design files (6)
Title Type Size (KB) Date
ZIP 442 02 Nov 2016
ZIP 791 02 Nov 2016
PDF 1160 02 Nov 2016
PDF 302 02 Nov 2016
PDF 76 02 Nov 2016
PDF 457 02 Nov 2016

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