120W dual-stage matrix compatible automotive headlight ECU reference design
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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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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM26420-Q1  Dual 2 A, automotive-qualified, high-efficiency synchronous DC/DC converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TCAN1042V-Q1  Automotive Fault Protected CAN Transceiver With Flexible Data-Rate  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPS57160-Q1  Automotive 3.5V to 60V, 1.5A Buck Converter with Eco-Mode™  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS92520-Q1  1.6-A dual synchronous buck LED driver with SPI   LED drivers  Not Available 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)
LM26420-Q1 Download Download
Download Download
TCAN1042V-Q1 Download Download
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TPS57160-Q1 Download Download
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TPS92520-Q1 Download -
TPS92682-Q1 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 3135 18 Oct 2019
Design files (6)
Title Type Size (KB) Date
ZIP 964 18 Oct 2019
ZIP 21601 18 Oct 2019
PDF 2322 18 Oct 2019
PDF 459 18 Oct 2019
PDF 70 18 Oct 2019
PDF 692 18 Oct 2019
Related Tools & Software

Reference Designs  ( 1 )

Name Part Number Tool Type
45-W, 15-W dual SEPIC LED driver reference design for automotive lighting  TIDA-050029  TI Designs

Design Kits & Evaluation Modules  ( 2 )

Name Part Number Tool Type
TPS92520-Q1 buck converter for automotive headlamp ECU evaluation module  TPS92520EVM-074  Evaluation Modules & Boards 
TPS92682-Q1 Constant voltage 2-phase boost evaluation module  TPS92682EVM-069  Evaluation Modules & Boards 

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