A8740 데이터 시트보기 (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

IGBT Drive Timing Definition

TRIG

GATE

50%

50%

tDr

tr

tDf

tf

90%

10%

90%

10%

Operation Timing Diagram

VBAT

VIN UVLO

CHARGE

SW

Target VOUT

VOUT

DONE

T1

T2

T3

TRIG

GATE

A

B

C

D

E

F

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-high transition at the CHARGE pin.

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.

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.

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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