A8740EEETR-T Allegro Microsystems Inc, A8740EEETR-T Datasheet - Page 9

• Manufacturer Part Number: A8740EEETR-T
• Description: Photoflash Capacitor Charger
• Manufacturer: Allegro Microsystems Inc
• Series: -r

Specifications of A8740EEETR-T

• Constant Current: -
• Constant Voltage: -
• Topology: Flyback
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Flash/Torch
• Type - Secondary: -
• Frequency: -
• Voltage - Supply: 1.5 V ~ 5.5 V
• Voltage - Output: -
• Mounting Type: *
• Package / Case: *
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A8740
Test conditions: V
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
IN
V
V
V
BAT
BAT
BAT
= 3.6 V, C
= 2.5 V
= 3.7 V
= 5.0 V
OUT
= 100 μF / 330 V UCC, transformer = T-16-024A (L
C2,C3,C4
C2,C3,C4
C2,C3,C4
Output Capacitor Charging at Various Battery Voltages
C1
C1
C1
Ultra Small Mobile Phone Xenon Photoflash
Charging Waveforms
Capacitor Charger with IGBT Driver
t
t
t
PRIMARY
=12.8 μH, N = 10.25), at room temperature
V
V
V
V
V
V
V
V
V
DONE
DONE
DONE
I
I
I
OUT
BAT
OUT
BAT
OUT
BAT
IN
IN
IN
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
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