A8439

更新时间： 2024-11-25 22:26:51

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器闪光灯双极性晶体管
页数	文件大小	规格书
12页	537K
描述
Photoflash Capacitor Charger with IGBT Driver and Refresh

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A8439 数据手册

A8439

Photoflash Capacitor Charger

with IGBT Driver and Refresh

Package EJ:

MLP/TDFN, 3 × 3 mm

0.75 mm Nominal Height

FEATURES

ꢀPower with 1 Li+ or 2 Alkaline/NiMH/NiCAD batteries

ꢀAdjustable output voltage

ꢀAutorefresh

ꢀ>75% efficiency

ꢀEight-level, digitally-programmable current limit

ꢀCharge complete indication

ꢀIntegrated IGBT driver with trigger

ꢀNo primary-side Schottky diode needed

ꢀLow-profile package (0.75 mm nominal height)

Approximate Scale 1:1

The A8439 is a highly integrated IC that charges

photoflash capacitors for digital and film cameras. An

integrated MOSFET switch drives the transformer in

a flyback topology. It also features an integrated IGBT

driver that facilitates the flash discharge function and

saves board space.

The CHARGE pin enables the A8439 and starts the

charging of the output capacitor. When the designated

output voltage is reached, the A8439 stops the charg-

ing until the CHARGE pin is toggled again. Pulling

the CHARGE pin low stops the charging. The ¯D¯O¯¯N¯¯E¯¯

pin is an open-drain indicator of when the designated

output voltage is reached.

APPLICATIONS

ꢀDigital camera flash

ꢀFilm camera flash

ꢀCell phone flash

ꢀEmergency strobe light

Two Alkaline/NiMH/NiCAD or one Li+ battery

or 1.5 to 5.5 V

3.0 to 5.5 V

BIAS

V_BATT

V_OUT

0.1 μF

4.7 μF

COUT

100 kΩ

VIN

CHARGE

A8439

The peak current limit can be adjusted to eight dif-

ferent levels between 270 mA to 1.4 A, by clocking

the CHARGE pin. This allows the user to operate the

flash even at low battery voltages.

The A8439 can be used with two Alkaline/NiMH/

NiCAD or one single-cell Li+ battery connected to the

transformer primary. Connect the VIN pin to a 3.0 to

5.5 V supply, which can be either the system rail or the

Li+ battery, if used.

DONE

TRIGGER

IGBTDRV

To IGBT Gate

GND

Figure 1. Typical circuit with separate power supply to transformer

One Li+ battery

or 3.0 to 5.5 V

BATT

V_OUT

The A8439 is available in a very low profile

(0.75 mm) 10-terminal 3×3 mm MLP/TDFN package,

making it ideal for space-constrained applications. It is

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

0.1 μF

4.7 μF

COUT

100 kΩ

VIN

CHARGE

A8439

DONE

TRIGGER

IGBTDRV

To IGBT Gate

GND

Figure 2. Typical circuit with single power supply

A8439-DS, Rev. 1

12 3 4 5 6 7...12

中文翻译

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与A8439相关器件

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A8439EEJTR-T	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver and Refresh
A8447	ALLEGRO	获取价格	High Voltage Step Down Regulator
A8447SLJTR-T	ALLEGRO	获取价格	High Voltage Step Down Regulator
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A8450KLB	ALLEGRO	获取价格	Automotive Multioutput Voltage Regulator
A8450KLB-T	ALLEGRO	获取价格	Automotive Analog Circuit, PDSO24
A8450KLBTR	ALLEGRO	获取价格	Fixed/Adjustable Positive Standard Regulator, 3 Output, 3.23V1 Min, 1.2V2 Min, 3.366V1 Max
A8450KLBTR-T	ALLEGRO	获取价格	Fixed/Adjustable Positive Standard Regulator, 3 Output, 3.23V1 Min, 1.2V2 Min, 3.366V1 Max
A847CY-100M	TOKO	获取价格	General Purpose Inductor, 10uH, 20%, 1 Element, SMD
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