ADI ADP1650 1.5A LED闪光驱动方案

ADI 公司的ADP1650是集成了I2C兼容接口的1.5A LED闪光驱动器.器件集成了1.5MHz或3.0MHz同步电感升压转换器,I2C兼容接口和1500mA电流源.火炬模式电流高达200mA,效率大于90%(峰值),主要用在照相手机和智能手机以及数码相机,摄像机和PDA.本文介绍了ADP1650主要特性,应用电路以及ADP1650 评估板套件主要特性,详细电路图和材料清单.

1.5 A LED Flash Driver with I2C-Compatible Interface

The ADP1650 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in low light environments. The device integrates a programmable 1.5 MHz or 3.0 MHz synchronous inductive boost converter, an I2C-compatible interface, and a 1500 mA current source. The high switching frequency enables the use of a tiny, 1 mm high, low cost, 1 μH power inductor, and the current source permits LED cathode grounding for thermally enhanced, low EMI, and compact layouts.

The LED driver maximizes efficiency over the entire battery voltage range to maximize the input-power-to-LED-power conversion and minimize battery current draw during flash events. A programmable dc battery current limit safely maximizes LED current for all LED VF and battery voltage conditions.
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