A8438(2005) Ver la hoja de datos (PDF) - Allegro MicroSystems

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A8438
(Rev.:2005)

Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8438 Photoflash Capacitor Charger with IGBT Driver

Performance Characteristics, continued

Tests performed using application circuit shown in figure 6 (unless otherwise noted)

Charge Time

VBIAS = 3.3 V, COUT = 100 μF, ILIM = 2 A, VOUT = 300 V

Connect VBATT to a separate power supply

6.5

5.5

4.5

3.5

2.5

1.5

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

VBATT (V)

Efficiency

TA = 25°C

90

VBATT = 3.0 V, VIN = 5.0 V

80

VBATT = VIN = 5.0 V

70

VBATT = VIN = 3.3 V

60

50

40

100

150

200

250

300

VOUT (V)

IGBT Drive Timing Definition

TRIGGER

IGBTDRV

50%

t Dr

tr

90%

10%

50%

t Df

tf

90%

10%

A8438-DS, Rev. 1

Allegro MicroSystems, Inc.

7

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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