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- Multiple-Channel Temp Sensing for Automotive LED Headlights Reference Design (Rev. A)
(PDF 751 KB)
03 Mar 2017 173 views
The TIDA-01381 TI Design details a solution on how to drive a string of matrix LED headlights, measure the temperature of the LEDs, and implement support for thermal foldback, which reduces the current in the LEDs as the LED temperature rises to prevent damage to the LEDs. The design uses TI temperature sensing solutions instead of negative temperature coefficient (NTC) thermistors in order to reduce the number of components, number of physical wires, and reduce number of pins used on microcontroller. This TI Design should be interfaced with a microcontroller to do the thermal foldback current derating of the LEDs. The input stage of the design includes electromagnetic interference (EMI) and electromagnetic compatibility (EMC) filters and can be directly supplied by a car battery.
- Multiple channel temperature sensing
- Efficiency-optimized design
- Operation through cold crank
- Load dump tolerant
- Reverse battery protection
- Thermal foldback