A6272中文资料Automotive Two-Channel Linear LED Controller with Internal PWM Dimming数据手册Allegro规格书

描述 Description

These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: December 5, 2018

Recommended Substitutions:  A6270-1

The A6272 is a linear programmable current controller capable of accurately regulating LED current in two strings with external MOSFETs. The LED current can be switched between high current and low current for stop/tail or DRL/position applications. The two LED current levels from each output are set by two sense resistors. Current reference accuracy for each string current is better than ±4%.

Driving LEDs with constant current ensures safe operation with maximum possible light output. ICs can be connected in parallel for larger lighting applications.

Drain short-to-ground detection is provided for both external MOSFETs. A6272 also offers MOSFET drain short-to-VIN and open-LED fault protection. The MODE pin controls the action of the IC in the case of a fault.

A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold. An input voltage monitor is included to reduce LED current if VIN rises enough to exceed the set level.

The device is available in a 16-pin TSSOP (LP) and a 16-pin wettable flank TQFN (ES), both with exposed pad for enhanced thermal dissipation. Both packages are lead (Pb) free, with 100% matte-tin leadframe plating.

特性 Features

• 5.3 to 40 V supply; operates down to 5.1 V, when enabled
• Flexible LED dimming options
• External PWM dimming set by microcontroller
• Current slew rate limit during PWM dimming
• Adjustable LED current derating for elevated VIN
• Low regulation voltage for low power dissipation
• Drain short-to-ground detection
• Drain short-to-VIN, LED open, and thermal protection

简介

A6272属于集成电路（IC）的LED驱动器。由制造生产的A6272LED 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。