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.
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 | Precision PWM Dimming LED Driver Reference Design for Automotive Lighting (Rev. A) | Jan. 12, 2017 |
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