Automotive Daytime Running Light Dual String LED Driver Reference Design with Current Balancing
TIDA-01581
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Key Document

Description

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 egulates 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. 

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

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Design Files

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TI Devices (4)

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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 Grade, 2.7V-Capable, 10 uA Analog Output Temperature Sensor  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
TLV2316-Q1  10-MHz, Rail-to-Rail Input/Output, Low-Voltage, 1.8-V CMOS Operational Amplifier  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 -

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Technical Documents

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User guides (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

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