45-W, 15-W dual SEPIC LED driver reference design for automotive lighting


Design files


This reference design showcases the TPS92682-Q1 dual-channel LED controller used in an automotive front lighting application with high beam (HB) and low beam (LB), daytime running light (DRL), and position (POS) light functionality. The design uses one TPS92682-Q1 device to implement a single-stage power solution to drive both the HB and LB channel, as well as the DRL and POS functionality with a controller area network (CAN) interface.  This simple design reduces component count and solution size as traditional implementation uses two separate controllers. The TPS92682-Q1 device includes internal and external PWM dimming support for additional flexibility as well as built-in monitoring for fault detection and protection of the continuous LED current. Electromagnetic interference (EMI) filtering is included and designed to meet CISPR-25, Class 5 conduction requirements.

  • Dual output controller
  • Coupled SEPIC design for DRL and POS
  • Uncoupled SEPIC design for HB and LB
  • CISPR-25 class 5 EMI solution
  • Switching frequency outside of AM band
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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.

TIDUEV3.PDF (3761 K)

Reference design overview and verified performance test data

TIDM229.PDF (317 K)

Detailed schematic diagram for design layout and components

TIDM230.PDF (304 K)

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

TIDM231.PDF (417 K)

Detailed overview of design layout for component placement

TIDM233.ZIP (1759 K)

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


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

TIDM232.PDF (1723 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Automotive LED drivers

TPS92682-Q1Dual channel constant-Voltage and constant current controller with SPI

Data sheet: PDF | HTML
Arm Cortex-M4 MCUs

MSP432E401YSimpleLink™ 32-bit Arm Cortex-M4F MCU with ethernet, CAN, 1MB Flash and 256kB RAM

Data sheet: PDF | HTML
Boost converters (integrated switch)

TPS61240-Q12.3-V to 5.5-V input range, 3.5-MHz fixed frequency 450-mA boost converter, AEC-Q100 qualified

Data sheet: PDF | HTML
Buck converters (integrated switch)

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

Data sheet: PDF | HTML
CAN transceivers

TCAN1042HV-Q1Automotive 70-V bus-fault-protected CAN transceiver with I/O level shifting and flexible data-rate

Data sheet: PDF | HTML
ESD protection diodes

TPD2E007Dual 10-pF, ±13-V, ±8-kV ESD protection diode for AC Signal Data Interfaces

Data sheet: PDF | HTML
Ideal diode/ORing controllers

LM74700-Q13.2-V to 65-V, 80-uA IQ automotive ideal diode controller

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide 45-W,15-W Dual SEPIC LED Driver Reference Design for Automotive Lighting Oct. 04, 2019

Related design resources

Hardware development

TPS92682EVM-069 TPS92682-Q1 constant voltage 2-phase boost evaluation module TPS92682EVM-070 TPS92682-Q1 constant current 2-channel boost and boost-to-battery evaluation module

Reference designs

TIDA-050002 55-W Dual Buck-Boost LED Driver Reference Design for Automotive High and Low Beam Headlight

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