A8425
High Current Photoflash Capacitor Charger
with IGBT Driver for Two Li+ Batteries
Functional Block Diagram
VIN
VBAT
ISET
VSEL
TLIM
DCMޓDetector
VSW 㧙VBAT
ILIM Comparator
VDS Ref 㧙
ISET
Buffer
tON(max)
18 μs
Gain
RC
Vth
㧙
tOFF(max)
18 μs
H→L
Triggereޓd Timer
SQ
㧙
RQ
Enable
CHARGE
VDRV
TRIGGER1
TRIGGER2
One-Shot
S
Q
R
㧙
Q
GND
Exposed Pad
SW
DMOS
DONE
GSOURCE
GSINK
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com