A6210中文资料3 A， 2 MHz降压稳压LED驱动器数据手册Allegro规格书

描述 Description

These parts are discontinued. Samples are no longer available. For new customers or new applications, please contact Allegro. Date of status change: December 2, 2014.

The A6210 is a buck regulator that uses valley current-mode control. This control scheme allows very short switch on-times to be achieved, making it ideal for applications that require high switching frequencies combined with high input voltages and low output LED span voltages.

Low system cost is accomplished through high switching frequencies of up to 2.0 MHz, allowing smaller and lower value inductors and capacitors. In addition, few external components are required through high levels of integration. Optimal drive circuits minimize switching losses.

The switching frequency is maintained constant, as the on-time is modulated by the input voltage. This feed-forward control ensures excellent line correction. The on-time is set by an external resistor pulled-up to the input supply.

Internal housekeeping and bootstrap supplies are provided which require the addition of only one small ceramic capacitor. A top-off charge pump ensures correct operation at light loads.

Internal diagnostics provide comprehensive protection against input undervoltages and overtemperatures.

The device package is a 16-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

Applications High brightness LEDs LED driver modules, power supplies and lamps, such as MR16 and MR11

特性 Features

• User-configurable on-time, achieving switching frequencies up to 2.0 MHz
• Brightness control through PWM of DIS pin
• Minimal external components required
• No output capacitor required
• Wide input voltage range: 9 to 46 V
• Low 0.18 V sense voltage for higher efficiency
• Output Current: up to 3.0 A
• Low standby current <100 µA
• Thermal shutdown
• Supplied in a thermally-enhanced 4 mm QFN package

简介

A6210属于集成电路（IC）的LED驱动器。由制造生产的A6210LED 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。