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 LED Driver for automotive head lamps and daytime running light (DRL): BD8381
ROHM Semiconductor has developed the BD8381, a single-chip LED driver for use with automotive LED headlamps and daytime running lights (DRLs), a market that continues to experience a high rate of growth. The device was developed specifically for automotive headlamp and DRL use and incorporates such features as a built-in PWM function for use with DRLs, which are becoming more common on vehicles sold in Europe and the United States, where automakers are pioneering their use. The single-chip design includes the entire range of functionality needed to serve as an LED driver circuit, which in previous designs has consisted of a general-purpose LED driver LSI or a series of discrete components.
Automakers have been gradually switching to LED lighting for automotive headlamps, and LED-based headlamps are expected to eventually account for most of the market due to the higher efficiency and longer service life promised by the technology. Increasingly, manufacturers are equipping their vehicles with LED-driven DRLs to ensure an optimal level of safety and visibility, and LED headlamps and DRLs are widely expected to become a fixture of automotive equipment specifications. At the current time, use of LED headlamps is limited to certain portions of the market such as the luxury segment, and automakers and headlamp manufacturers have used general-purpose LED driver LSIs or designs based on discrete components, necessitating the inclusion of a separate driver circuit when equipping the vehicle with DRLs. ROHM launched an early effort to develop a dedicated LSI for use with LED headlamps based on its forecast of the future adoption of this technology, leading to the development of an LSI incorporating all the functionality needed to serve as an LED driver that would be used with headlamps. The BD8381 provides PWM light modulation without a microcontroller by incorporating a built-in oscillator circuit for use with DRLs. The part also offers a range of protective functionality to detect headlamp faults such as LED short and open states to better meet the automotive market’s need for a high level of reliability. This design feature dramatically improves reliability by allowing the number of components in the part to be reduced compared to solutions consisting of discrete components or general-purpose LED driver LSIs. An absolute maximum voltage of 50 V gives the product sufficient dielectric strength to withstand battery voltage fluctuations.
Key features: 1. Input voltage range of 5 V to 30 V
More information under: http://www.rohm.com/products/lsi/power/automotive_body_control/434sel7/#lineup    |
