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A8837

Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8837

Photoflash Capacitor Charger with IGBT Driver

Operation Timing Diagram

VUVLO

VIN

CHARGE

SW

Target VOUT

VOUT

DONE

TRIGGER

IGBTDRV

A

B

C

D

E

F

Explanation of Events:

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

B. Charging stops when VOUT reaches the target voltage. ¯D¯¯O¯¯N¯¯E¯ goes low, to signal the

completion of the charging process.

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 VUVLO level when CHARGE goes high.

F. After VIN goes above VUVLO, another low-to-high transition at the CHARGE pin is

required to start charging.

IGBT Drive Timing Definition

TRIGGER

IGBTDRV

50%

tDr

tr

90%

10%

50%

tDf

tf

90%

10%

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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