Automotive Multi Channel LED Driver Reference Design for HVAC HMI
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Key Document


In HVAC (heating, ventilation, and air conditioning) HMI (human machine interface) the displays and buttons are illuminated with many of LEDs. The drive circuit for these LEDs are traditionally realized in a discreet way so that an MCU drives external low side BJTs that sink current, limited by series resistor, to the LEDs. The BJTs may be driven with a PWM signal in order to get the dimming effect or they could be used simply like an on/off switch. This reference design is an alternative cost-effective LED driver solution capable of driving multiple LEDs without using current-limiting resistors. The reference design allows the designer to individually adjust the current, as well as the PWM-dimming signal, in each diode excluding those that are connected in series to one pin.

  • Configurable 16-channel LED driver
  • Independent control of each channel
  • LED dimming adjustment to the ambient light intensity
  • Constant current control

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPT3001-Q1  Automotive digital ambient light sensor (ALS) with high-precision human-eye response  Specialty sensors  Sample & Buy View Design Kits & Evaluation Modules
TLC59116-Q1  Automotive 16-channel FM+ I2C-Bus constant-current LED sink driver  LED drivers  Sample & Buy Not Available
TPS709-Q1  Automotive 150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPT3001-Q1 Download Download
TLC59116-Q1 Download Download
TPS709-Q1 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1137 11 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 376 20 Nov 2017
ZIP 873 20 Nov 2017
PDF 580 20 Nov 2017
PDF 244 20 Nov 2017
PDF 62 20 Nov 2017
PDF 245 20 Nov 2017
Related Tools & Software

Hardware development (1)

Name Part Number Tool Type
MSP430G2 LaunchPad Development kit  MSP-EXP430G2  Evaluation board 

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