AL3644中文资料DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER数据手册Diodes规格书

描述 Description

The AL3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The AL3644 utilizes a 2MHz or 4MHz fixed frequency synchronous boost converter to provide power to the dual 1.5A constant current LED sources. The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the AL3644 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers independently programmable currents in each output leg to drive the LEDs in a Flash or Movie Mode (Torch) condition.

The 2MHz or 4MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10μF) ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range.

特性 Features

•Dual Independent 1.5A LED Current Source Programmability
•Accurate and Programmable LED Current Range from 1.4mA to 1.5A
•Torch Currents up to 360mA (AL3644TT)
•Flash Timeout Values up to 1.6 seconds (AL3644TT)
•Optimized Flash LED Current During Low Battery Conditions (Input Voltage Flash Monitor)
•> 85% Efficiency in Torch Mode (at 100mA) and Flash Mode (at 1A to 1.5A)
•Grounded Cathode LED Operation for Improved Thermal Management 
•Small Solution Size: < 16mm2
•Hardware Strobe Enable (STROBE)
•Synchronization Input for RF Power Amplifier Pulse Events (TX)
•Hardware Torch Enable (TORCH/TEMP)
•Remote NTC Monitoring (TORCH/TEMP)
•400kHz I2C-Compatible Interface
•AL3644 (I2C Address = 0x63)
•Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
•Halogen and Antimony Free. “Green” Device (Note 3)

应用 Application

• Camera Phone White LED Flash

简介

AL3644属于开发板套件编程器的评估板-LED驱动器。由制造生产的AL3644评估板 - LED 驱动器LED 驱动器评估板是带有元器件的电路板，用于提供特定电路或器件的工作实例。该系列评估板提供一个 LED 驱动器实例，用于可调节闪烁、模拟亮度、背光、双极开关、升压转换器、亮度控制、相机闪光灯、可调光、恒流和 RGB 控制，以及更多其他应用。