A8425中文资料High Current Photoflash Capacitor Charger with IGBT Driver for Two Li+ Batteries数据手册Allegro规格书

描述 Description

This part is discontinued. Samples are no longer available.

Date of status change: March 4, 2013.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

The A8425 charges photoflash capacitors for digital cameras, camcorders, and DSC combos. An integrated 55 V DMOS switch drives the transformer in a flyback topology optimized for 2-cell Li+ battery input. An integrated IGBT driver with separate source and sink pins allows high performance red-eye reduction implementation.

The A8425 offers programmable peak switch current limit from 1.0 to 3.2 A, continuously adjustable using a resistor to ground. A proprietary control scheme optimizes the capacitor charging time. Low quiescent current and low shutdown current further improve system efficiency and extend battery life.

The A8425 is available in 16-contact 3 mm × 3 mm TQFN packages. This small, very thin profile (0.75 mm nominal overall height) package is ideal for space-constrained applications. It is lead (Pb) free, with 100% matte-tin leadframe plating.

Applications include:

SLR camera flashDigital camcorder/DSC combo flash2 Li+ input strobe

特性 Features

• Wide battery voltage range: 1.5 to 11 V
• Integrated 55 V DMOS switch in very thin profile 3 mm × 3 mm, 0.75 mm nominal height package
• Peak current limit continuously adjustable from 1.0 to 3.2 A
• Output voltage sensing on primary side: no resistor divider required
• >75% efficiency
• Fast charge time
• Charge Complete indication
• Flexible, high current IGBT drive
• Independent IGBT driver supply
• Separate sink and source pins with 6 Ω pull-up and 20 Ω pull-down
• Interlocked trigger pin improves noise immunity
• No primary-side Schottky diode needed

简介

A8425属于集成电路（IC）的电源管理-专用。由制造生产的A8425电源管理 - 专用专用型电源管理集成电路 (PMIC) 用于电源的控制或操作，适合特定或小范围的目标应用，例如汽车气囊管理、电容器组平衡、AC 公共电力监控、存储器总线端接、接地故障检测、能量收集、小型引擎管理、处理器或芯片集专用电压调节、负载突降保护、触觉驱动器、热电制冷器控制等。