CISPR25 Automotive Tail Light Reference Design for Step-Down + Linear LED Driver Based Systems


Design files


TIDA-00677 showcases an automotive LED tail light application (tail/stop, turn and reverse) by using the TPS92630-Q1 linear LED driver supplied by an upstream buck converter (TPS65321-Q1) which is directly supplied through a smart-reverse battery diode off the automotive battery voltage. The design has also been subjected to EMI/EMC radiation and pulse tests according to CISPR25 and ISO 7637-2. More information regarding potential cost savings and efficiency (power dissipation and system thermals) can be found in the user guide. For a similar design driven by a boost converter, see TIDA-00678. For a similar design driven directly from a car battery, see TIDA-00679.

  • Efficiency-optimized design
  • CISPR-25 tested EMI/EMC
  • Stays out of AM band
  • Load-dump tolerant
  • Smart reverse battery protection
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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

TIDCC81.ZIP (1044 K)

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

TIDRLZ2.PDF (2529 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Automotive LED drivers

TPS92630-Q1Automotive Three-channel Linear LED driver with Analog and PWM dimming

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74610-Q10.48-V to 42-V, zero IQ automotive ideal diode controller

Data sheet: PDF | HTML
Multi-channel ICs (PMICs)

TPS65321A-Q1Automotive 3.6V to 36V, 3.2A Buck Converter with Wide Vin 280mA LDO Regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide CISPR25 Tested Automotive Tail Light for Step-Down Linear LED Design Guide (Rev. A) Sep. 14, 2016

Related design resources

Reference designs

TIDA-00678 CISPR25 Tested Automotive Tail Light Reference Design for Step-Up + Linear LED Driver Based Systems TIDA-00679 Linear LED Driver Reference Design for Automotive Lighting Applications

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