a8837 Allegro MicroSystems, Inc., a8837 Datasheet - Page 3

• Manufacturer Part Number: a8837
• Description: Photoflash Capacitor Charger With Igbt Driver
• Manufacturer: Allegro MicroSystems, Inc.

A8837
IGBTDRV
CHARGE
GND
Device Pin-out Diagram
VIN
NC
1
2
3
4
5
CHARGE
TRIGGER
DONE
VIN
10
I
9
8
7
6
LIM
Decoder
NC
FB
DONE
TRIGGER
SW
IGBTDRV
V IN
Terminal List Table
Adjustable
Reference
Number
1,10
(dV/dt = 0)
Detector
2
3
4
5
6
7
8
9
DCM
CMP2
Functional Block Diagram
Comparator
TRIGGER Strobe signal input
IGBTDRV IGBT driver gate drive output
CHARGE
I
Photoflash Capacitor Charger with IGBT Driver
LIM
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯
Name
GND
GND
VIN
SW
NC
FB
Enable
No connection
Power supply input
Device ground
Charging enable and ISWLIM code input; set to low to power-off
the A8837
Switch, internally connected to the DMOS power FET drain
Open drain, when pulled low by internal MOSFET, indicates that
charging target level has been reached
Output voltage feedback
H
Triggered Timer
18 μs
L
Control Logic
S
R
SET
One-Shot
CLR
Q
Q
Q
Q
SET
CLR
Function
S
R
Q
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
CMP1
40 V
DMOS
1.2 V
FB
SW
3