120W dual-stage matrix compatible automotive headlight ECU reference design


Design files


This reference design details a headlight ECU using an interleaved boost in voltage regulation mode feeding four synchronous buck channels. This design is also capable of matrix headlight control and is mounted to a heatsink and enclosure to emulate an automotive headlight ECU. The TPS92682-Q1 is setup as a two phase interleaved boost controller set in voltage regulation mode capable of 130W output power. The boost output drives two TPS92520-Q1 dual channel synchronous buck drivers for a total of four buck channels at 120W total output. The design is mounted to a heatsink and enclosed to emulate an automotive headlight ECU. A MSP432 processor controls the TPS92682-Q1 and the two TPS92520-Q1 devices by the SPI interface. The MSP432 communicates to the master via CAN and also communicates to the lighting matrix module using UART communications via a CAN transceiver. Several bench-test results are available for this design including efficiency data, thermal measurements, pixel-controlled load data, and EMC measurements according to the CISPR 25 Class 5 conducted specification.

  • Four synchronous monolithic buck channels capable of pixel controlled, dynamic LED loads
  • Each buck channel capable of up to 1.5A/55W; Total ECU power output of 120W
  • 9 to 24 V full power operating range, power de-rated down to 6V inputs
  • Interleaved boost voltage with 130W output
  • Full enclosure leveraging the top exposed pad of the buck for high power density and shielding
  • Controllable via CAN interface
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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.


Reference design overview and verified performance test data

TIDM280.PDF (692 K)

Detailed schematic diagram for design layout and components

TIDM281.PDF (70 K)

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

TIDM282.PDF (459 K)

Detailed overview of design layout for component placement

TIDM284.ZIP (21601 K)

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


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

TIDM283.PDF (2322 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Automotive LED drivers

TPS92520-Q11.6-A dual synchronous buck LED driver with SPI

Data sheet: PDF | HTML
Automotive LED drivers

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

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

LM26420-Q1Dual 2 A, automotive-qualified, high-efficiency synchronous DC/DC converter

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

TPS57160-Q1Automotive 3.5V to 60V, 1.5A Buck Converter with Eco-Mode™

Data sheet: PDF | HTML
CAN transceivers

TCAN1042V-Q1Automotive fault-protected CAN transceiver with I/O level shifting and flexible data-rate

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide 120W Dual-Stage Matrix Compatible Automotive Headlight ECU Reference Design (Rev. A) Nov. 27, 2019

Related design resources

Hardware development

TPS92520EVM-074 TPS92520-Q1 buck converter for automotive headlamp  TPS92682EVM-069 TPS92682-Q1 constant voltage 2-phase boost evaluation module

Reference designs

TIDA-050029 45-W, 15-W dual SEPIC LED driver reference design for automotive lighting

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