Description

The A8502 is a multi-output white LED driver for small-size LCD backlighting. It integrates a current-mode boost converter with internal power switch and two current sinks. The boost converter can drive up to 24 LEDs, 12 LEDs per string, at 120 mA. The LED sinks can be paralleled together to achieve even higher LED currents, up to 240 mA. The A8502 can operate with a single power supply, from 5 to 40 V, which allows the part to withstand load dump conditions encountered in automotive systems.

Features and Benefits

• AEC-Q100 qualified

• Wide input voltage range of 5 to 40 V for start/stop, cold crank and load dump requirements

• Fully integrated LED current sinks and boost converter with 60 V DMOS

• Sync function to synchronize boost converter switching frequency up to 2.3 MHz, allowing operation above the AM band

• Excellent input voltage transient response

• Single resistor primary OVP minimizes VOUT leakage

• Internal secondary OVP for redundant protection

• LED current of 120 mA per channel

• Drives up to 12 series LEDs in 2 parallel strings

• 0.7 to 0.8 LED to LED matching accuracy

• PWM and analog dimming inputs

• 5000:1 PWM dimming at 200 Hz

• Provides driver for optional external PMOS input disconnect switch

• Extensive protection against:

▫Shorted boost switch or inductor

▫Shorted FSET or ISET resistor

▫Shorted output

▫Open or shorted LED pin

▫Open boost Schottky

▫Overtemperature (OTP)

Applications:

LCD backlighting or LED lighting for:

▫Automotive infotainment

▫Automotive cluster

▫Automotive center stack

A8502属于集成电路（IC） > LED 驱动器。Allegro MicroSystems制造生产的A8502LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。