LED solutions shine spotlight on external automotive lighting

The latest LED solutions for automotive applications from Rohm Semiconductor extend the range of high performance and power efficient LED drivers used in many automotive applications for interior as well as exterior lighting. Within this range, Rohm can offer the latest developments in exterior lighting such as high/low-beam LED headlights, matrix/pixel LED dynamic front lights and sequential turn indicators.

For example, the BD18312MUF LED driver could support high/low beam LED headlights or day running lamp (DRL) mode for day light and fog lights. It incorporates a boost and 2 buck converters and is controlled by a microcontroller via serial peripheral interface (SPI). The SPI provides controllability and reports back the system status for high system reliability.

The company’s SPI controlled matrix LED controller for headlights allows adaptive front lighting. It consists of individual switches to control up to six LEDs with individual brightness control and diagnostics for each LED. If there is a system failure the device will switch to a pre-defined standalone mode.

Rohm’s matrix controllers, the BD18360 and BD18361, can be used for the dynamic turn indicators. To address different markets there is one product developed for the stand-alone functionality (BD18360) and one which makes use of an MCU for advanced communication function control (BD18361). The required constant current for the Matrix controllers can be delivered by the buck LED driver (BD18391EFV-M).

Overall, these solutions are aimed at providing high performance with advanced diagnostics and protection features, thermal management and low EMI, and enable sophisticated, compact and energy efficient solutions for enhanced reliability.



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