Datasheet > A8425

A8425

更新时间： 2024-09-14 12:24:03

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	439K
描述
High Current Photoflash Capacitor Charger

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A8425 数据手册

A8425

High Current Photoflash Capacitor Charger

with IGBT Driver for Two Li+ Batteries

Features and Benefits

Description

▪ 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 from1.0 to 3.2 A

▪ Output voltage sensing on primary side: no resistor divider

required

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

separatesourceandsinkpinsallowshighperformancered-eye

reduction implementation.

▪ >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

TheA8425offersprogrammablepeakswitchcurrentlimitfrom

1.0to3.2A, continuously adjustable using a resistor to ground.

Aproprietary 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.Thissmall,verythinprofile(0.75mmnominaloverall

height) package is ideal for space-constrained applications. It

is lead (Pb) free, with 100% matte-tin leadframe plating.

▪ Interlocked trigger pin improves noise immunity

▪ No primary-side Schottky diode needed

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

Battery Input

to 5.5V

1.5 to 11 V

3.0

1 : 10

C_OUT

100 μF

C₁

C₂

315

VIN

VBAT

VOUT Detect

TLIM

ISET

Control

Block

ISW sense

RSET

VPULLUP

DONE

CHARGE

100 kΩ

DONE

GSRC

VDRV

IGBT Driver

TRIGGER1

TRIGGER2

IGBT Gate

GSNK

GND

A8425-DS, Rev. 1

12 3 4 5 6 7...16

中文翻译

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与A8425相关器件

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A8430EK	ALLEGRO	获取价格	LED Driver, 1-Segment, PDSO5, SOT-23, 5 PIN
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