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Infineon's new LED drivers target auto lighting systems

18 Feb 2015

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Infineon introduced its LITIX Basic family of LED drivers specifically designed for low-power to medium-power automotive exterior lighting applications. The LITIX Basic family reduces system complexity and improves reliability of turn indicator, tail, stop and reverse LED lights, allowing automotive manufacturers to expand the use of brand-specific and safety-enhancing LED light systems.

The LITIX Basic family can provide precise control across 15 pin-compatible linear current sources with one to three output channels and current ratings from 60mA to 180mA. It supports advanced diagnostic functions directly at the LED's point of load, which allows car manufacturers to achieve high light quality.

Today, the majority of LED rear light designs still use discrete resistor solutions for the control of the LEDs. Apart from being costly, these designs increase the complexity and lowers reliability of LED rear light configurations due to high discrete components count. Printed circuit board part counts can be reduced by about 40 per cent, with corresponding reduction in risk of failures and savings in both the design and assembly phase.

With parallel connection of several LITIX Basic LED drivers, load currents higher than the 180mA of individual devices can be easily realised. The LITIX Basic family features overload and over-temperature protection in all devices including output current reduction, and also a wide supply voltage range of 5.5V to 40V.

For devices with integrated diagnostics, SC (short circuit), OL (open load) or N-1 (diagnostic bus between devices) functionality can be chosen for LED chain failure detection. The LITIX Basic drivers can perform centralised diagnosis—where the failure diagnosis is controlled by a centralised body control module—as well as decentralised diagnosis to enable real-time fault detection.

In a decentralised architecture, the LED drivers communicate with a microcontroller which can be located within the rear light or an extra-module near it. Whether centralised or decentralised, the LED drivers can quickly identify faulty light functions for fast repair. This fulfils safety aspects and legal requirements and helps maintain the appearance of the car as designed by the car manufacturer and thus the high-quality image of a car brand.

A further option of the LITIX Basic LED drivers is the PWM (Pulse Width Modulation) engine that helps to easily realise two different light levels within one light, such as a combination of stop and tail light function.

Volume production of all 15 LITIX Basic LED drivers has started. LITIX Basic devices are available in a lead-free "green" RoHS (Restriction of Hazardous Substances)-qualified SSOP package with 14 pins and exposed pad (PG-SSOP-14EP).

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