A6267中文资料Automotive High Current LED Controller数据手册Allegro规格书

描述 Description

These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.

Date of status change: July 1, 2019.

Deadline for receipt of LAST TIME BUY orders: December 27, 2019.

Recommended Substitutions: A6271KLPTR-T-1

The A6267 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. Driving the LEDs in series ensures identical currents and uniform brightness. For automotive applications, optimum performance is achieved when driving up to 15 LEDs at currents up to 1 A.

The A6267 provides a cost-effective solution using an external logic-level MOSFET and minimum additional external components. The maximum LED current is set with a single external sense resistor and can be modified using a current reference input. Direct PWM control is possible via the Enable input, which also provides a shutdown mode.

This DC-DC converter can be configured as a ground-referenced boost converter or as a supply-referenced boost converter providing buck-boost capability. The buck-boost topology used ensures that there is no leakage path through the LEDs when in shutdown and no inrush current at power-up.

Integrated diagnostics and two fault outputs give indication of undervoltage, chip overtemperature, output open circuit, LED short circuit and LED undercurrent, and can be configured to provide short to supply and short to ground protection for the LED connections. A unique feature is the ability to detect one or more shorted LEDs.

The device is provided in a 16-pin TSSOP package with exposed thermal pad (suffix LP). It is lead (Pb) free, with 100% matte tin leadframe plating.

Applications Automotive high power LED lighting systemsFog lights, reversing lights, daytime running lightsHeadlights Related PartsA6265 Automotive High Current LED Controller A6266 Automotive High Current LED Controller

特性 Features

• Constant current LED drive
• Boost or buck-boost modes
• Programmable switching frequency 100 to 700 kHz
• Single and multiple LED short indication
• PWM dimming control
• 10 µA shutdown current including LED leakage

简介

A6267属于集成电路（IC）的LED驱动器。由制造生产的A6267LED 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。