A8740 Просмотр технического описания (PDF) - Allegro MicroSystems

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A8740

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8740

Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

Functional Block Diagram

VBAT

VSW – VBAT

ILIM

Reference

VDSref

VIN_DRV

DCM

Detector

OCP

ton(max)

18 μs

CHARGE

TRIG

toff(max)

18 μs

HmL

Triggered Timer

SQ

RQ

Control Logic

SQ

RQ

Enable

SW

DMOS

DONE

VIN_DRV

IGBT Driver

GATE

GND

Pin-out Diagram

DONE 1

TRIG 2

GATE 3

GND 4

8 CHARGE

7 VIN_DRV

PAD

6 VBAT

5 SW

(Top View)

Terminal List

Number Name

1

¯D¯ ¯O¯ ¯N¯ ¯E¯

2

TRIG

3

GATE

4

GND

5

SW

6

VBAT

7

VIN_DRV

8

CHARGE

–

PAD

Function

Open collector output, pulls low when output reaches target value and CHARGE is

high. Goes high during charging or whenever CHARGE is low.

IGBT trigger input.

IGBT gate drive output.

Ground connection.

Drain connection of internal DMOS switch. Connect to transformer primary winding.

Battery voltage.

Input voltage. Connect to 3 to 5.5 V bias supply. Decouple VIN voltage with 0.1 μF

ceramic capacitor placed close to this pin.

Charge enable pin. Set this pin low to shut down the chip.

Exposed pad for enhanced thermal dissipation. Connect to ground plane.

Allegro MicroSystems, Inc.

3

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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