NXP two compact LED drivers for automotive LED lighting

In 2008 the EU has announced that since February 2011, new cars, small trucks are equipped with daytime running lights (DRL), other trucks, buses will also be equipped with in August 7, 2012, the EU's move will further accelerate the automotive LED market growth,. Audi's A8, R8 and A4 series are equipped with LED day light.

Industry statistics, the service life of the LED light source is the traditional 20 to 25 times, 10 times longer than the halogen lamp. Compared with the traditional light source, the same power LED output lumens than ordinary bulbs 3 to 4 times higher than the halogen lamp high to 3 times. The use of LED also helps to improve fuel economy and reduce carbon dioxide emissions. To day lights, ordinary light bulbs per kilometer of carbon dioxide emissions of 1.2g, LED was reduced to 0.58g. With its long life and low power consumption, LED successfully entered the automotive market. However, the application of LED to out of vehicle lighting also needs to be integrated, flexible and networked.

Complete NXP of automotive LED lighting launched into highly flexible drive chip ASL1010NTK and ASL1010PHN, integrated many core functions. The compact MCU can be used to construct the LED lighting control circuit without the need of external chip. In addition, in the current input conduction process, ripple current will be evident in the LED performance, generally through the filter to avoid the effect of ripple current of LED, the solution to eliminate the ripple current to avoid the use of external filters, significantly reduce the external components required for driving circuit.

ASL1010NTK 8 pin version 3 package size * 3mm and LED can be integrated on the same printed circuit board, the number of different automotive lighting applications, LED lighting module used a driving circuit is also different. NXP launched this system solution can support 1 ~ 20 LED series, the output voltage range of 6V ~ 60V, can support different vehicle platforms, including hybrid vehicles.

ASL1010PHN for the same series of 16 pin version, with direct classification and increase input resistance, short circuit protection function, prevent the attachment errors such as damage LED. There are also differences in the characteristics of different LED manufacturers and different LED batches, while the steep forward characteristics of LED will cause a slight change in the driving voltage to cause a strong fluctuation of the driving current. LED manufacturers must be based on the LED color, brightness of different levels, according to the need to design and optimize the LED drive circuit. NXP launched ASL1010 PHN (16 pin version) can be classified according to the different characteristics of the LED resistor in order to achieve the flexibility of the drive circuit, given the system manufacturers to design, procurement of LED lights more freedom.

ASL1010NTK and ASL1010PHN can be combined with the temperature feedback, PWM control the current through LED to prevent LED from overheating.

Of these two products is NXP for automotive LED lighting drive to launch the first product, 2011 formally put into production. In the future, NXP plans to integrate the power switch, the integrated bus interface (CANLIN interface), and the multi-channel driver to drive the light group to form the speed of light. NXP will drive the integration of the LED and then pushed to a new height - sensor temperature sensing, then the LED driver chip will need no temperature feedback resistor can sense the temperature of LED.