Optoelectronics
LED matrix manager empowers high density automotive intelligent and safe front light system
By Jason Bai, applications engineer, Analog Devices T
he LED matrix manager provides original equipment manufacturers (OEMs) with an advanced front light system that enhances safety and distinguishes their brand. It
offers seamless integration, high performance coupled with safety features, and effectively reduces electromagnetic interference (EMI). Additionally, it incorporates a built-in logarithmic fade-in/fade-out function, low RDS(ON), and slew rate control for optimal operation. This article will discuss how the LED matrix manager can be used to elevate the intelligence of automotive front light system designs.
Introduction
They feature glare-free high beams, LED, and matrix lighting, which together form adaptive driving beam (ADB) systems. These ADB systems eliminate the risk of blinding oncoming traffic. To further enhance safety and comfort for drivers, automotive OEMs are incorporating additional adaptive lighting functions (AFS) like cornering light and dynamic curve light.
The increasing adoption of intelligent front light systems is primarily driven by safety and the desire for unique brand identities. These systems are growing at a rate of 8.3 per cent annually.1
The LED matrix manager plays a crucial role by efficiently managing current for matrix and pixel lighting. It typically controls LED voltage (up to 65V) using 6 to 12 integrated switches, simplifying design and saving time. Its integrated MOSFET, rated between 5V and 14V, has a low on-resistance RDS(ON)
to handle LED currents up to 2A. Additionally, the LED matrix manager offers an optimal pulse-width modulation (PWM) dimming setup with exceptional performance. This includes smooth transitions between PWM dimming states and the option for internal or external clock control for PWM dimming.
The rapid advancements in the dimming performance of the LED matrix manager are contributing significantly to increased safety,
34 March 2026 Figure 1. An LED front light system.
improved driving experiences, and enhanced brand identities.
Advantages of LED headlights Currently, automobiles use halogen, xenon, or LED lamps for their front lights. Xenon lamps were common in higher end vehicles for a while, but now LED lamps are becoming more popular. It’s likely that LED lamps will soon be the most common choice.
The differences among these lamps are summarised in Table 1. LED lamps are brighter than halogen, but not as bright as xenon. Xenon lamps can be too dazzling at night. Typically, halogen lamps use only 20 per cent of their power for light, while LED lamps use
, allowing it Brightness
Energy Efficiency Lifespan Size
Price Halogen Lamp
Low Low
Short Large
Low Xenon Lamp High
Medium Medium Large
Medium Table 1. Comparison between halogen lamp, xenon lamp, and LED Lamp Components in Electronics LED Lamp
Medium High
Very long Small
High 80 per cent.2 Even though LED lamps cost
more initially, their long lifespan and energy efficiency can save money in the long run. They are also smaller, giving carmakers more design freedom for headlights.
LED exterior front light system overview
A front light system as shown in Figure 1 includes a microcontroller, voltage sources, current sources, and LED lamps. The microcontroller, referred to as the LED module
www.cieonline.co.uk Figure 2. LED fault detection.
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