View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.
- Precision PWM Dimming LED Driver Reference Design for Automotive Lighting (Rev. A)
(PDF 3158 KB)
12 Jan 2017
The TIDA-01183 TI Design details a solution on how to use pulse width modulation (PWM) to dim an automotive headlight or tail light with a precision of better than 2% duty cycle without the necessity of using a micro controller. This allows the design to be very 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. The TLC555-Q1 LinCMOS timer, together with the 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 designs input stage is EMI/EMC filtered and can be directly supplied by the cars battery.
- Precisioin PWM dimming
- Efficiency-optimized design
- Operation through cold crank
- Load dump tolerant