With the development of the automotive industry, more and more advanced lighting technologies are getting more applications in automobiles. Among them, light-emitting diode (LED) lighting has the advantages that halogen lamps and xenon lamps can't match, such as long life, fast response time, energy saving and environmental protection, etc., which accelerates the pace of adoption in automobile lighting.

As the premier supplier of high-performance silicon solutions for energy-efficient electronic products, ON Semiconductor continues to focus on automotive lighting applications such as automotive headlamps, dashboard backlighting, interior lighting, door lighting and taillights, based on advanced semiconductor technology. Provides a wide range of solutions including standard and custom products, such as Stepper Motor drivers, LED drivers, xenon lamp drivers, halogen lamp drivers, LED backlight drivers, etc.; especially in Xenon lamp driver ICs for headlamp adjustment and deflection Leading the market in terms of (ASIC) and stepper drives that are the de facto standard.

Car headlight development trend

At present, the headlights of most cars on the road are still halogen lamps, mainly providing high beam and low beam (HB) functions. Among them, the low beam typically consumes 55 W and the light output is about 1,000 lumens. In comparison, the introduction of high-intensity gas discharge lamp (HID) technology for more than 10 years has a power consumption of 35 W and an optical output of approximately 3,500 lumens. Due to the high luminous intensity of the HID lamp, there is a risk of glare to the driver of the vehicle. For safety reasons, some countries require a low beam with a horizontal position automatic adjustment function and a high pressure cleaning device. Over time, more and more HID lamps will incorporate the high beam function into the dual xenon lamp solution.

As energy-saving requirements become more stringent, while halogen technology is still used for headlamp lighting, automotive design is increasingly turning to LED lighting. LED lighting offers enhanced styling options for "instant" illumination, allowing brightness control from 0% to 100% power.

Another important trend in automotive headlamp applications is the adaptive headlamp system (AFS) that provides beam deflection to optimize cornering illumination, and adaptive headlamps (ADB) to adjust the beam in real time to the actual environment. Stepper motors provide control for AFS and ADB.

ON Semiconductor offers a broad lineup of automotive headlamp lighting applications ranging from general lamp driver solutions to stepper drives, LED drivers and xenon lamp drivers.

ON Semiconductor Automotive Lighting Solutions Example

1) Headlight adjustment and deflection

ON Semiconductor's AMIS-30623 single-chip microstepping motor driver is suitable for horizontal adjustment and deflection control of headlamps. It integrates a controller and LIN interface, and uses a LIN host to implement a dedicated mechatronic solution for remote connectivity. The device receives position adjustment commands via the bus and then drives the motor coils to the desired position, using current, speed, acceleration, and deceleration configuration parameters. The AMIS-30623 also detects motor stall conditions.

There are two other devices from ON Semiconductor that can be used in these applications. The NCV70521 and NCV70522 are single-chip microstepping motor drivers with current conversion meters and SPI interfaces. The NCV70522 also includes an embedded 5 V regulator and watchdog reset function. The device acts as a peripheral driver that accepts the “next microstep” command from the microcontroller and synchronizes the motor coil current to the desired speed. The integrated SPI bus allows parameter setting and diagnostic feedback.

2) Advanced LED headlamp power ballast and dual LED driver

ON Semiconductor's NCV78663 single-chip, smart headlamp LED driver enables high-beam, low beam, daytime running lights, position lights, cornering auxiliary lights, turn indicators, and single-chip fog lamps control. The NCV78663 integrates digital dimming, SPI programmable settings and built-in diagnostics to provide an integrated, energy-efficient integrated headlamp control solution.

3) LED combined taillight linear current steady flow and controller

ON Semiconductor's NCV7680 includes eight linear programmable constant current sources. The system design of the NCV7680 achieves two brightness levels, one for the brake light and one for the tail illumination; an optional PWM control is also available, which is the preferred method for dimming the LED. The fixed frequency of the PWM generator provides flicker free illumination. An optional external ballast FET helps achieve a power distribution that requires a high current design.

To support the common automotive taillight (RCL) configuration of LED strings, the NCV7680 provides eight matched outputs to drive each string of LEDs and a resistor to set the current. A separate LED string drive ensures equal current distribution between the LED strings.

The NCV7680 can be used as a stand-alone device or as an additional support circuit for complex systems. When combined with the boost controller, additional LEDs can be connected as a single LED string. Typical applications include combined taillights, daytime running lights (DRL), fog lights, central high-position brake lights (CHMSL) arrays, turn indicators and other external modulation applications, liquid crystal display (LCD) backlights, and more.

Microstepping is a method of controlling stepper motors, typically used to achieve higher resolution or smoother motion at low speeds.
Micro stepper motor divides each full step into smaller steps to help smooth out the motor`s rotation, especially at slow speeds. 
Microstepping is achieved by using pulse-width modulated (PWM) voltage to control current to the motor windings. The driver sends two voltage sine waves, 90 degrees out of phase, to the motor windings. While current increases in one winding, it decreases in the other winding. This gradual transfer of current results in smoother motion and more consistent torque production than full- or half-step control.

Micro Stepper Motor

Micro stepper motor,Micro linear stepper motor,Micro stepping stepper motor

Shenzhen Maintex Intelligent Control Co., Ltd. , https://www.maintexmotor.com