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 regulates 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.
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, Daytime Running Light, Dual-String LED Driver Reference Design | Jan. 19, 2018 | |
| Technical article | Designing daytime running lights, part 2: responding to an LED fault | PDF | HTML | Dec. 06, 2018 | |
| Technical article | Designing daytime running lights, part 1: adding one-fail-all-fail LED fault detec | PDF | HTML | Dec. 04, 2018 |
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