A8438

更新时间： 2024-09-16 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
13页	528K
描述
Photoflash Capacitor Charger with IGBT Driver

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A8438 数据手册

A8438

Photoflash Capacitor

Charger with IGBT Driver

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

ꢀ>75% efficiency

ꢀThree levels of switch current limit: 1.6, 1.8, 2.0 A

ꢀFast charge time

ꢀCharge complete indication

Approximate Scale 1:1

ꢀIntegrated IGBT driver with trigger

ꢀNo primary-side Schottky diode needed

ꢀLow-profile package (0.75 mm nominal height)

The A8438 is a highly integrated IC that charges

photoflash capacitors for digital and film cameras. It

also features an integrated IGBT driver that facilitates

the flash discharge function and saves board space.

To charge the photoflash capacitor, the A8438

integrates a 40 V, DMOS switch that drives the trans-

former in a flyback topology, allowing optimized

design with tight coupling and high efficiency. A pro-

prietary control scheme optimizes the capacitor charg-

ing time. Low quiescent current and low shutdown

current further improve system efficiency and extend

battery life.

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

10 kΩ

100 kΩ

VIN

ILIM

2.0 A

1.8 A (N.C.)

1.6 A

Three levels of switch current limit are provided:

1.6, 1.8, and 2.0 A. The level is determined by config-

uring the ILIM pin as grounded, floating, or pulled up

to IC supply voltage, respectively.

CHARGE

A8438

DONE

TRIGGER

IGBTDRV

To IGBT Gate

GND

The CHARGE pin enables the A8438 and starts the

charging of the output capacitor. When the designated

output voltage is reached, the A8438 stops the charg-

ing until the CHARGE pin is toggled again. Pulling

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

is an open-drain indicator of when the designated out-

put voltage is reached.

Figure 1. Typical circuit with separate power supply to transformer

One Li+ battery

or 3.0 to 5.5 V

BATT

V_OUT

0.1 μF

4.7 μF

COUT

The A8438 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.

10 kΩ

100 kΩ

VIN

ILIM

2.0 A

1.8 A (N.C.)

1.6 A

CHARGE

A8438

DONE

The A8438 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.

TRIGGER

IGBTDRV

To IGBT Gate

GND

Figure 2. Typical circuit with single power supply

A8438-DS, Rev. 1

12 3 4 5 6 7...13

中文翻译

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与A8438相关器件

型号	品牌	获取价格	描述	数据表
A8438_06	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8438_13	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8438EEJ-T	ALLEGRO	获取价格	Analog Circuit, 1 Func, PDSO10, 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, MO-229WEED, TDFN-10
A8438EEJTR-T	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver
A8439	ALLEGRO	获取价格	Photoflash Capacitor Charger with IGBT Driver and Refresh
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
A8450	ALLEGRO	获取价格	Automotive Multioutput Voltage Regulator
A8450KLB	ALLEGRO	获取价格	Automotive Multioutput Voltage Regulator

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