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.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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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
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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Automotive Multichannel LED Driver for HVAC HMI Reference Design (Rev. A) | Jan. 11, 2019 |
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