Automotive Multi Channel LED Driver Reference Design for HVAC HMI


Design files


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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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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

TIDCE16.ZIP (376 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
* Design guide Automotive Multichannel LED Driver for HVAC HMI Reference Design (Rev. A) Jan. 11, 2019

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