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


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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Design Files

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TI Devices (7)

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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
LM74700-Q1  3.2-V to 65-V, 80-uA IQ automotive ideal diode controller  Power switches  Sample & Buy View Design Kits & Evaluation Modules
MSP432E401Y  SimpleLink™ 32-bit Arm Cortex-M4F MCU with ethernet, CAN, 1MB Flash and 256kB RAM  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TCAN1042HV-Q1  Automotive 70-V bus-fault-protected CAN transceiver with I/O level shifting and flexible data-rate  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPD2E007  Dual 15-pF, ±13-V, ±8-kV ESD protection diode for AC Signal Data Interfaces  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules
TPS61240-Q1  2.3-V to 5.5-V input range, 3.5-MHz fixed frequency 450-mA boost converter, AEC-Q100 qualified  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS92682-Q1  Dual channel constant-Voltage and constant current controller with SPI  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
LM74700-Q1 Download -
MSP432E401Y Download Download
TCAN1042HV-Q1 Download Download
Download Download
TPD2E007 Download Download
Download -
Download -
TPS61240-Q1 Download Download
TPS92682-Q1 Download

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Technical documentation

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Datasheet (1)
Title Type Size (KB) Date
PDF 6341 09 Mar 2021
User guide (1)
Title Type Size (KB) Date
PDF 3761 04 Oct 2019
Design files (6)
Title Type Size (KB) Date
ZIP 701 04 Oct 2019
ZIP 1759 04 Oct 2019
PDF 1723 04 Oct 2019
PDF 417 04 Oct 2019
PDF 304 04 Oct 2019
PDF 317 04 Oct 2019
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
55-W Dual Buck-Boost LED Driver Reference Design for Automotive High and Low Beam Headlight  TIDA-050002  Reference design 

Hardware development (2)

Name Part Number Tool Type
TPS92682-Q1 constant current 2-channel boost and boost-to-battery evaluation module  TPS92682EVM-070  Evaluation board 
TPS92682-Q1 constant voltage 2-phase boost evaluation module  TPS92682EVM-069  Evaluation board 

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