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In the next 8 years, the overall annual growth rate of automotive lighting systems will reach 10%, and the market has great potential, and the drives for such systems will have similar growth. 
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In today's rapidly evolving automotive lighting market, the role of LED drivers is particularly important: to provide car manufacturers with more energy-efficient options to meet consumer fuel economy requirements, improve visibility safety to reduce or avoid traffic accidents, and create personalities. The atmosphere of the vehicle reaches the consumer's unique expectation of the car...
Driver requirements for automotive lighting
LEDs are devices that change brightness based on current, while LED drivers provide a constant light output by adjusting the power of an LED or string of LEDs. Each automotive lighting solution requires a unique drive design that requires engineers to select the right LED driver for their specific application to maximize energy efficiency based on different requirements such as series or parallel, high or low power, and cost or function.
The factors that determine which LED driver is best for its application include:
- The total LED power of each function? - This is the key to determining the topology of the LED driver.
- Electronic ambient temperature? - For example, taillights require brighter LEDs, and it is better to choose a more energy efficient switch driver instead of a high power linear driver to keep cooling at higher power levels.
- Change the flexibility of LED configuration - Light adjustment can be done using a variety of brightness methods such as reference voltage control and pulse width modulation control. Wide work
The power range provides the power configuration and the number of LEDs that can be driven.
- Supported features - such as auto dimming, individual LED controls, color changes.
- Supported troubleshooting and compliance with safety standards - such as thermal alarms, thermal shutdown, open/short circuit, overcurrent protection, over/under voltage and single LED failure.
Figure 1: Driver solution for LED lighting
Future lighting drivers will need to have the following factors to support the automotive manufacturer's system requirements:
- Scalable, with flexible hardware to support different automotive applications and requirements to be launched;
- There are different drive requirements in the same module: high pressure gas discharge lamp (HID), LED, etc.;
- As the drive adds more functionality, consider adding diagnostics;
- Reliable LED current control for improved drive reliability.
ON Semiconductor's automotive lighting innovation
Automotive lighting applications will proliferate inside and outside the car, and lighting systems will become more popular in all automotive segments. The expansion of the market will promote more silicon development. ON Semiconductor is actively working with this market trend to focus on linear, switch-mode drives and commercial/universal and system integration solutions that continue to drive energy-efficient innovation in the automotive lighting market.
(1) Today's automotive interior lighting
Most of today's automotive interior lighting uses white LED drivers and RGB red, green and blue programmable drivers.
Bright white LEDs are mainly used for ceiling lamps, reading lamps, cargo compartment lights and other applications where brightness is relatively high, but it is different from standard bulbs, providing a warm and comfortable atmosphere for the driver. Its dimming slope characteristics can be generated. Unique and differentiated shapes and effects. ON Semiconductor offers discrete or constant current stabilized silicon solutions for this type of application.
RGB and white LEDs complement each other, and their development is driven by the power of the vehicle to be personalized, used as a programmable internal light source, including special effects such as instrument panel, center console, navigation/audio and other regional lighting and ambient lights. The color accuracy needs to be calibrated, and the separate LIN corresponds to an RGB, plus regional dimming, which are important features that meet the requirements of automotive manufacturers. ON Semiconductor offers a Linear System Basis Chip (SBC) for this type of application, and the SBC interface provides all the functions of driving RGB LEDs via the LIN bus.
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