Automotive Multiple Channel Temperature Sensing for LED Headlight Reference Design


Design files


This reference design details how to drive a string of matrix LED headlights, measure the temperature of the LEDs and implement support for thermal foldback which reduces the current in the LEDs as the LED temperature rises to prevent damage to the LEDs. The design uses temperature sensing instead of negative temperature coefficient (NTC) thermistors in order to reduce the number of components, number of physical wires and reduce the number of pins used on the microcontroller. TIDA-01381 should be interfaced with a microcontroller to do the thermal foldback current derating of the LEDs. The input stage of the design includes electromagnetic interference (EMI) and electromagnetic compatibility (EMC) filters and can be directly supplied by a car battery.

  • Multiple-channel temperature sensing
  • Efficiency-optimized design
  • Operation through cold crank
  • Load-dump tolerant
  • Reverse battery protection
  • Thermal foldback
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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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

TIDCD74.ZIP (507 K)

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

TIDRPZ2.PDF (1129 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
* Design guide Multiple-Channel Temp Sensing for Automotive LED Headlights Reference Design (Rev. A) Mar. 03, 2017

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