A8740 Просмотр технического описания (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

Charging Waveforms

Output Capacitor Charging at Various Battery Voltages

Test conditions: VIN = 3.6 V, COUT = 100 μF / 330 V UCC, transformer = T-16-024A (LPRIMARY =12.8 μH, N = 10.25), at room temperature

Oscilloscope settings: Ch1 = ¯D¯¯O¯¯N¯¯E¯ (5 V / div), Ch2 = Battery Voltage (1 V / div), Ch3 = Output Voltage (50 V / div), Ch4 = Input Current (200 mA V / div),

Time scale = 1 sec / div

VOUT

VBAT = 2.5 V

C2,C3,C4

C1

VBAT = 3.7 V

C2,C3,C4

C1

VBAT = 5.0 V

VBAT

IIN

VDONE

t

VOUT

VBAT

IIN

VDONE

t

VOUT

VBAT

C2,C3,C4

C1

IIN

VDONE

t

Allegro MicroSystems, Inc.

9

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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