Datasheet > A8426

A8426

更新时间： 2024-11-02 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		闪光灯
页数	文件大小	规格书
16页	443K
描述
High Performance Photoflash Capacitor Charger

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A8426 数据手册

A8426

High Performance Photoflash Capacitor Charger

with IGBT Driver

Features and Benefits

Description

▪ Wide battery voltage range: 1.5 to 11 V

▪ Integrated 55 V DMOS switch with 3.2 A current capability

▪ User-adjustable peak current limit, from 1 to 3.2 A

▪ Secondary-side voltage sensing for easily-adjustable

output voltage

The A8426 is a highly integrated IC that rapidly charges

photoflash capacitors for SLR cameras, digital cameras, and

camcorders with integrated digital cameras. A flexible IGBT

driver is integrated to save board space.

TheA8426integratesa3.2A-capable,55V-ratedDMOSswitch

that drives the transformer in flyback configuration, allowing

optimized design with tight coupling and high efficiency. The

peak switch current is user-adjustable between 1 and 3.2 A,

using a resistor to ground. A proprietary control scheme

optimizes the capacitor charging time. Low quiescent current

and low-power Standby mode current further improve system

efficiency and extend battery life.

▪ >75% efficiency

▪ Fast charging time

▪ Charge complete indication

▪ Flexible, high current IGBT driver

▫ Independent IGBT driver supply

▫ Separate sink and source pins with 6 Ω pull-up and

20 Ω pull-down

▫ Interlocked trigger pins improve noise immunity

▪ No primary-side Schottky diode needed

The A8426 is available in a 16-contact 3 mm×3 mm TQFN

package with exposed pad for enhanced thermal performance.

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.

Package: 16-contact TQFN (suffix ES)

Applications include:

▪ SLR camera flash

▪ Digital camcorder/DSC combo flash

▪ 2 Li+ input strobe

Approximate Scale 1:1

Typical Application

Bias Input

3.0 to 5.5 V

Battery Input

1.5 to 11 V

VBAT

1 : 10

COUT

100 μF

330 V

VIN

TLIM

ISET

150 k7

Control

Block

150 k7

I_SWsense

RSET

VPULLUP

CHARGE

1.20 k7

DONE

100 kΩ

DONE

VDRV

IGBT Driver

GSOURCE

TRIGGER1

TRIGGER2

IGBT Gate

GSINK

GND

Figure 1. Typical application circuit with resistor bridge control of feedback.

A8426-DS, Rev. 1

12 3 4 5 6 7...16

中文翻译

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