Dalian University launched a comprehensive analysis of ST-based follow-up steering headlight solutions

On December 2, 2015, Dalian United Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that the United Nations Alliance Group has launched ST-based L9942 follow-up headlights (AdapTIve Front-LighTIng System) , referred to as AFS) solution.

Figure 1 - Schematic diagram of the AFS system of the company

Follow-up headlights, which are called auto-adaptive headlight systems or smart headlight systems, can continuously adjust the headlights according to the steering wheel angle, vehicle yaw rate and driving speed. The steering angle keeps the direction of the light in line with the current direction of the car to ensure optimal illumination of the road ahead and to provide the driver with the best visibility, which significantly enhances the safety of driving in the dark. In the road conditions with poor road lighting or multiple corners, the driver's field of vision is enlarged, and the other party can be reminded to come in advance.

Figure 2 - AFS system architecture diagram of the company

Follow-up headlights AFS is one of the latest technologies in the field of headlight lighting. It is also an active safety system that is closely related to driving safety. Many mid- to high-end cars are equipped with AFS systems, such as: BMW 530Li, Mercedes-Benz. E-class cars and Citroen Triumph, etc., and become one of its selling points.

Figure 3 - Architecture diagram of ST L9942 used by Affiliated Friends of the United States in the AFS system

Product features of the ST L9942 include:

Up to 1.3 loads on two full bridges (Rdson=500 mΩ)

Programmable current waveform and lookup table: 5 and 9 bit resolution

Integrated pulse width modulation controller and current regulation for internal current sensing

Programmable stepping modes: full, half, small and miniature

Programmable conversion rate optimized for electromagnetic compatibility and power loss

Programmable fast, slow, mixed and auto decay modes

Full-scale current programmable 3-bit resolution

Programmable stall detection

Step clock input reduces the requirements of the μ controller

Very low current consumption in standby mode IS "3 μA, typ. Tj ≤ 85 °C

All output short circuit protection, such as overload current, openload, high temperature warning and thermal shutdown

The pulse width modulation signal of the internal pulse width modulation controller can be used as a digital output

All parameters are guaranteed in 3 V "Vcc" 5.3 V and for 7 V "Vs" 20 V range

Figure 4 - Major applications and advantages of the ST L9942 represented by the company

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