CISPR 25 Class 5 Rated 7.5W Tail-Light Reference Design for Automotive LED Lighting System


Design files


This reference design is for automotive tail-light applications. The design features TPS92638-Q1 linear LED driver powered by a synchronous buck converter (LM53601-Q1) that is directly supplied from the automotive-battery voltage. This design helps pass CISPR 25 Class 5 conduct emission and radiated emission without an CMCC filter. The reference design also optimizes efficiency.

  • 9-V to 36-V wide Vin range supports eight-channel LED lighting in 2.1-MHz integrated, low Iq buck converter
  • Synchronous buck converter with 2.1 MHz 
  • Single differential filter for all switching converters
  • Pass CISPR 25 Class 5 FM-radio band without common-mode choke
  • All devices AEC-Q100-qualified version available
Output voltage options TIDA-01348.1 TIDA-01348.2
Vin (Min) (V) 9 7.7
Vin (Max) (V) 36 7.7
Vout (Nom) (V) 7.7 6
Iout (Max) (A) 1 .96
Output Power (W) 7.7 5.76
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Synchronous Linear Regulator

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.

TIDUCS9.PDF (5385 K)

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


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

TIDRQR6.PDF (9569 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM53601-Q1Automotive 3.5-V to 36-V, 1-A synchronous 2.1-MHz step-down converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Automotive LED drivers

TPS92638-Q1Automotive 8-channel Linear LED driver with PWM dimming

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

TLC2274A-Q1Automotive advanced LinCMOS™ rail-to-rail quad precision operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide CISPR 25 Class-5 Rated 7.5-W Tail-Light Ref Design for Automotive LED Lighting May 04, 2017

Related design resources

Reference designs

TIDA-00677 CISPR25 Automotive Tail Light Reference Design for Step-Down + Linear LED Driver Based Systems TIDA-00846 Automotive high-side dimming rear light reference design

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