TIDA-01183

Precision PWM Dimming LED Driver Reference Design for Automotive Lighting

TIDA-01183

Design files

Overview

This reference design shows how to use pulse width modulation (PWM) to dim an automotive headlight or tail light with precision of better than 2% duty cycle without the necessity of using a microcontroller. This allows the design to be cost competitive. Devices used in this design are the TPS92691-Q1 multi-topology LED driver in boost and boost to battery configuration controlling the LEDs.  TLC555-Q1 LinCMOS timer, together with OPA2377-Q1 operational amplifier, measure and generate an accurate PWM signal by applying a feedback loop and a precision shunt regulator for setting the duty cycle accurately. The design's input stage is EMI/EMC filtered and can be directly supplied by the car's battery.

Features
  • Precision PWM dimming
  • Efficiency-optimized design
  • Operation through cold crank
  • Load-dump tolerant

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.

TIDUC97A.PDF (3158 K)

Reference design overview and verified performance test data

TIDROD8.PDF (457 K)

Detailed schematic diagram for design layout and components

TIDROD9.PDF (76 K)

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

TIDROE0.PDF (302 K)

Detailed overview of design layout for component placement

TIDROE2.ZIP (791 K)

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

TIDCCU0.ZIP (442 K)

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

TIDROE1.PDF (1160 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Automotive LED drivers

TPS92691-Q1Automotive multi-topology LED driver with rail-to-rail current sense amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA2377-Q1Automotive-Qualified, Rail-to-Rail In/Out, Low Noise, 5MHz CMOS Operational Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

TL431-Q1Automotive adjustable precision shunt regulator (pin layout: KRA)

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Precision PWM Dimming LED Driver Reference Design for Automotive Lighting (Rev. A) Jan. 12, 2017

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