a8439eej-t Allegro MicroSystems, Inc., a8439eej-t Datasheet - Page 3

• Manufacturer Part Number: a8439eej-t
• Description: A8439 Photoflash Capacitor Charger With Igbt Driver And Refresh
• Manufacturer: Allegro MicroSystems, Inc.

A8439
IGBTDRV
CHARGE
GND
Device Pin-out Diagram
VIN
NC
1
2
3
4
5
CHARGE
TRIGGER
DONE
VIN
I
LIM
10
9
8
7
6
Decoder
NC
FB
DONE
TRIGGER
SW
Photoflash Capacitor Charger with IGBT Driver and Refresh
IGBTDRV
V IN
Adjustable
Reference
Terminal List Table
Number
1,10
2
3
4
5
6
7
8
9
1.2 V
Functional Block Diagram
Comparator
Comparator
DCM
CMP2
CMP3
I
TRIGGER Strobe signal input
IGBTDRV IGBT driver gate drive output
LIM
CHARGE
GND
Name
GND
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯
VIN
SW
NC
FB
Enable
H → L
Triggered Timer
No connection
Power supply input
Device ground
Charging enable and ISWLIM code input; set to low to power-off
the A8439
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
18 μs
Control Logic
S
R
SET
CLR
Q
Q
Function
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