Datasheet > A8731

A8731

更新时间： 2022-05-19 14:31:33

品牌	Logo	应用领域
急速微 - ALLEGRO		闪光灯手机摄像机
页数	文件大小	规格书
16页	466K
描述
The Allegro A8731 Xenon photoflash charger IC is designed to meet the needs of ultra-low power, small form factor cameras, particularly camera-phones.

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A8731 数据手册

A8731

Mobile Phone Xenon Photoflash Capacitor Charger

With IGBT Driver

Features and Benefits

Description

TheAllegro^®A8731 Xenon photoflash charger IC is designed

tomeettheneedsofultra-lowpower,smallformfactorcameras,

particularly camera-phones.

▪ Low quiescent current draw (0.01 μA in shutdown mode)

▪ Primary-side output voltage sensing; no resistor divider

required

The charge time is adjustable by setting the charge current

limit from 0.4 to 1.2 A maximum. By using primary-side

voltagesensing, theneedforasecondary-sideresistivevoltage

divideriseliminated.Thishastheadditionalbenefitofreducing

leakage currents on the secondary side of the transformer. To

extend battery life, theA8731 features very low supply current

draw—typically 0.01 μA in shutdown mode and 10 μA in

standby mode.

TheA8731hasaflashdualtriggerIGBTdriver.TheIGBTdriver

alsohasinternalgateresistorsforminimumexternalcomponent

count. The charge and trigger voltage logic thresholds are set

at 1.1 V_HI(min) to support applications implementing low

voltage control logic.

▪ User-adjustable current limit from 0.4 to 1.2 A

▪ 1.1 V logic (V_HI(min)) compatibility

▪ Integrated IGBT driver with internal gate resistors

▪ Flexible dual trigger inputs for IGBT driver

▪ Optimized for mobile phone, 1-cell Li+ battery applications

▪ No primary-side Schottky diode needed

▪ Zero-voltage switching for lower loss

▪ >75% efficiency

▪ Charge complete indication

▪ Integrated 40 V DMOS switch

Applications

▪ Mobile phone flash

▪ Digital and film camera flash

The A8731 is available in a 10-contact 3 mm × 3 mm DFN

package with a 0.75 nominal overall package height, and an

exposed pad for enhanced thermal performance.

Package: 10-contact DFN with exposed

thermal pad (package EJ)

Approximate Scale 1:1

Typical Applications

1 : 10

Battery Input

2.3 to 5.5 V

Battery Input

2.3 to 5.5 V

COUT

100 μF

315 V

COUT

100 μF

VIN

315 V

VOUT Detect

ISET

Control

Block

Control

Block

_SWsense

I_SWsense

RSET

VPULLUP

100 kΩ

DONE

CHARGE

DONE

GATE

DONE

GATE

IGBT Driver

TRIGGER1

TRIGGER2

TRIGGER1

TRIGGER2

IGBT Gate

GND

Figure 1. Typical application with separate trigger inputs.

A8731-DS, Rev. 1

Figure 2. Typical application with single trigger input.

12 3 4 5 6 7...16

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