55-W Dual Buck-Boost LED Driver Reference Design for Automotive High and Low Beam Headlight
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Key Document


This reference design describes a TPS92692-Q1 LED driver in a dual, high-beam and low-beam application with a single controller and power stage. The design operates in boost mode to provide the high beam and in boost to battery mode to provide the low beam. The single controller power stage design results in a simpler and more cost-effective lighting system. Additional design flexibility of the TPS92692 device includes analog and PWM dimming support as well as built-in monitoring for fault detection and protection of the continuous LED current. EMI filtering is included and designed to meet CISPR-25, Class 5 conduction requirements.

  • Dual mode: Boost mode for high beam + low beam and boot to battery mode for low beam
  • CISPR-25 Class 3 and Class 5 EMI Solutions
  • Spread spectrum frequency modulation
  • Operation through warm crank and load dump
  • Continuous LED current monitoring output

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)1616
Vin (Max) (V)88
Vout (Nom) (V)444
Iout (Max) (A)1.251.25
Output Power (W)555
Input TypeDCDC
TopologyBuck Boost- Non SyncBuck Boost- Non Sync

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM74700-Q1  3.2-V to 65-V, 80-uA IQ automotive ideal diode controller  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS92692-Q1  high-accuracy LED controller with spread spectrum frequency modulation and internal PWM Generator  LED drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM74700-Q1 Download -
TPS92692-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1405 17 May 2018
Design files (5)
Title Type Size (KB) Date
ZIP 548 03 Nov 2018
PDF 451 03 Nov 2018
PDF 151 03 Nov 2018
PDF 57 02 Nov 2018
PDF 186 02 Nov 2018
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
TPS92692-Q1 Boost and Boost-to-Battery LED Driver Evaluation Module  TPS92692EVM-880  Evaluation board 

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