CISPR 25 Class 5 Rated 7.5W Tail-Light Reference Design for Automotive LED Lighting System
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This TI Design details a solution for an automotive tail-light application. The design features the 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 design also optimizes the solution efficiency.  

  • 9V to 36V Wide Vin range support 8 channel LED lighting in 2.1MHz Integrated, Low Iq Buck Converter
  • Synchronous Buck converter with 2.1MHz 
  • Single Differential Filter for all the Switching Converters
  • Pass CISPR 25 Class 5 FM radio band without common mode choke
  • All devices AEC-Q100 qualified version available

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)97.7
Vin (Max) (V)367.7
Vout (Nom) (V)7.76
Iout (Max) (A)1.96
Output Power (W)7.75.76
Input TypeDCDC
TopologyBuck- SynchronousLinear Regulator

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM53601-Q1  3.5V to 36V, 1A Synchronous 2.1MHz Step-Down Converter for Automotive Applications  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
TLC2274A-Q1  Automotive advanced LinCMOS™ rail-to-rail quad precision operational amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS92638-Q1  Automotive 8-channel Linear LED driver with PWM dimming  LED drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM53601-Q1 Download Download
TLC2274A-Q1 Download Download
Download Download
TPS92638-Q1 Download Download

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Technical documentation

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Datasheet (3)
Title Type Size (KB) Date
PDF 5115 15 Jan 2020
PDF 2090 18 Mar 2016
PDF 1293 02 Feb 2016
User guide (1)
Title Type Size (KB) Date
PDF 5385 04 May 2017
Design files (6)
Title Type Size (KB) Date
ZIP 322 03 May 2017
ZIP 20 03 May 2017
PDF 9569 03 May 2017
PDF 392 03 May 2017
PDF 86 03 May 2017
PDF 299 03 May 2017
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Reference Designs (2)

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