A8732 datasheet(6/20 Pages) ALLEGRO

部品番号	A8732

部品情報	Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

PDF	20 Pages

Scroll/Zoom	100%

メーカー	ALLEGRO [Allegro MicroSystems]

ホームページ	http://www.allegromicro.com

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6 / 20 page

Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

A8732

IGBT Drive Timing Definition

GATE

TRIG

tDr

tDf

50%

10%

90%

50%

10%

90%

Operation Timing Diagram

high transition at the CHARGE pin.

VOUT

CHARGE

DONE

VIN

VBAT

TRIG

GATE

Explanation of Events

A: Start charging by pulling CHARGE to high, provided that VIN is above UVLO level.

B: Charging stops when VOUT reaches the target voltage.

C: Start a new charging process with a low-to-

D: Pull CHARGE to low to put the controller in low-power standby mode.

E: Charging does not start, because VIN is below UVLO level when CHARGE goes high.

F: After VIN goes above UVLO, another low-to-high transition at the CHARGE pin is required to

start the charging.

UVLO

Target VOUT

T1, T2, T3 (Trigger instances): IGBT driver output pulled high whenever the TRIG pin is at logic

high. It is recommended to avoid applying any trigger pulses during charging.

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