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A8732

Ultra Small Mobile Phone Xenon Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8732

Ultra Small Mobile Phone Xenon Photoflash

Capacitor Charger with IGBT Driver

Average Input Current versus Battery Voltage at Various ILIM

Transformer LPRIMARY = 12.8 μH, N =10.25, VIN =3.6 V, at room temperature

0.7

0.6

ILIM1 (1.50A)

0.5

ILIM3 (1.36A)

ILIM5 (1.22A)

0.4

ILIM7 (1.07A)

0.3

ILIM9 (0.93A)

ILIM11 (0.79A)

0.2

ILIM13 (0.65A)

0.1

ILIM15 (0.51A)

0.0

1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Battery Voltage (V)

Note: Peak switch current is limited by the maximum on-time and di/dt of the transformer primary

current; therefore, average input current drops at very low battery voltage.

Allegro MicroSystems, Inc.

10

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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