Allegro's A80803 is a switch-mode constant current controller for high-power LED automotive lighting that addresses many of the common pain points of headlamp design, with innovative features and lower cost solutions that allow headlamp designers to easily Bringing Advanced Lighting to Common Mainstream Vehicles
Today's high-end and luxury cars have many comfort and safety features, but often take years to make their way into lower-priced mainstream cars, mostly because of the cost of the solution. Vehicle lighting plays an important role in terms of driver and passenger safety. According to a recent study by the Insurance Institute for Highway Safety (IIHS), driving at night is three times as risky as daytime, and vehicles with IIHS "good" rated headlights have nearly 20 fewer crashes than those with a "poor" rating. %. Enhanced lighting can improve road visibility and vehicle visibility at night, thereby significantly reducing driver response time, helping to prevent collisions and saving lives.
The A80803 provides headlamp designers with a compact, cost-effective solution that automatically manages the electrical transition from low beam to high beam without the need for multiple LED drivers and local microcontrollers. The A80803 is a unique product that helps to democratize headlight design, improve driver and passenger safety, and provide consumers with an engaging and personalized driving experience.
Features and Benefits
The A80803 delivers the following innovative features and benefits to help simplify headlight design, improving occupant safety and personalizing the experience.
● Multi-topology high beam/low beam switching without the need for a second LED driver IC
● Unique slew-control function to minimize LED current overshoot and undershoot when switching between high beam and low beam
● Two configuration options, one is a factory programmed EEPROM, eliminating the need for a local microcontroller, and the other is a control and status register SPI interface for software control
● Extensive diagnostics for ASIL with two programmable fault pins and reporting via SPI
● Multiple methods for simulating LED settings/controlling substrate intensity, thermal foldback via negative temperature coefficient (NTC), or using different LEDs for the same design
● Multiple PWM LED control methods, direct PWM control of EN/PWM pin (MCU mode) via internal PWM signal (independent mode) or external PWM signal
