Automotive Daytime Running Light Dual String LED Driver Reference Design with Current Balancing
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical documentation

Support & Training

Order Now

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Key Document


This reference design is a dual string LED driver that implements an operational amplifier based circuit which balances the current in two LED rings. The operational amplifier circuit senses current in a reference string and uses feedback from a mirrored string to bias a MOSFET that regulates the current between the strings. The design uses the TPS92692-Q1 multi-topology LED driver in a boost configuration to drive the LEDs. The TPS92692-Q1 features spread spectrum frequency modulation for EMI performance, analog current adjustment and internal PWM dimming.  This design includes adjustable linear thermal foldback using the LMT87-Q1 analog temperature sensor, as well as current limiting, in the event the mirrored string fails open circuit. The design also features two brightness modes. One mode is a full brightness mode ('DRL') and the other is a PWM dimming mode ('Position') which reduces brightness.

  • Dual string current balancing using a single LED driver
  • CISPR25 Class 5 conducted and radiated emissions tested
  • PWM dimming
  • Operation without a microcontroller

See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Design Guide

Get results faster with test and simulation data that's been verified.

Download Design Guide

Design Files

Download ready-to-use system files to speed your design process. Get Viewer.

Download Design Files

TI Devices (4)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM2901V-Q1  Automotive Catalog Quad Differential Comparator, Enhanced Voltage  Amplifiers  Sample & Buy Not Available
LMT87-Q1  Automotive ±2.7°C 2.7V to 5.5V analog output temperature sensor with -13.6 mV/°C gain  Temperature sensors  Sample & Buy Not Available
TLV2316-Q1  AEC-Q100, 2-Channel, 10-MHz, RRIO, low-noise, low-voltage, 1.8-V CMOS op amp  Operational amplifiers (op amps)  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)
LM2901V-Q1 Download -
Download Download
LMT87-Q1 Download
TLV2316-Q1 Download
TPS92692-Q1 Download Download

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical documentation

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guide (1)
Title Type Size (KB) Date
PDF 1435 19 Jan 2018
Design files (6)
Title Type Size (KB) Date
ZIP 123 27 Feb 2018
ZIP 958 27 Feb 2018
PDF 568 27 Feb 2018
PDF 233 27 Feb 2018
PDF 46 27 Feb 2018
PDF 404 27 Feb 2018

Support & training

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles