Automotive Daytime Running Light (DRL) LED Driver Reference Design with Linear Thermal Foldback


Design files


The TIDA-01382 reference design is a precision pulse width modulation (PWM) dimming solution for daytime running lights (DRL) including thermal foldback without requiring a microcontroller (MCU). The design includes key peripherals like electromagnetic interference (EMI) filtering, electromagnetic compatibility (EMC) filerting, voltage conditioning (shunt regulator), thermal foldback, precision clock generation, and LED drive.

  • Linear thermal foldback for LED protection
  • Precision PWM signal with 2% accuracy
  • Designed for operation through cold crank, load dump and reverse battery conditions
  • Efficiency optimized design
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCL3.PDF (2241 K)

Reference design overview and verified performance test data

TIDRQ29.PDF (429 K)

Detailed schematic diagram for design layout and components

TIDRQ30.PDF (74 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRQ31.PDF (267 K)

Detailed overview of design layout for component placement

TIDRQ33.ZIP (842 K)

Files used for 3D models or 2D drawings of IC components

TIDCD83.ZIP (505 K)

Design file that contains information on physical board layer of design PCB

TIDRQ32.PDF (1262 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT87-Q1Automotive ±2.7°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain

Data sheet: PDF | HTML
Automotive LED drivers

TPS92691-Q1Automotive multi-topology LED driver with rail-to-rail current sense amplifier

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA2377-Q1Automotive-Qualified, Rail-to-Rail In/Out, Low Noise, 5MHz CMOS Operational Amplifier

Data sheet: PDF | HTML
Shunt voltage references

TL431-Q1Automotive adjustable precision shunt regulator (pin layout: KRA)

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Driving DRL LEDs With Thermal Foldback Design Guide PDF | HTML Feb. 24, 2017
Technical article How to use temperature sensors to achieve linear thermal foldback in automotive LE PDF | HTML Mar. 01, 2017

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