a8439eej-t Allegro MicroSystems, Inc., a8439eej-t Datasheet - Page 7

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

A8439
Performance Characteristics, continued
Tests performed using application circuit shown in figure 8
with I
Conditions
Symbol
SWLIM
C1
C2
C3
C4
t
8
7
6
5
4
3
2
set to 1.4A (Single rising edge on CHARGE pin), unless otherwise noted
Parameter Units/Division
Parameter
8
7
6
5
4
3
2
I
V
V
2.0
V
Primary
V
V
time
2
BATT
BATT
OUT
OUT
SW
Connect VBATT to a separate power supply
2.5
V
2.5
V
OUT
OUT
= 300 V
V
= 300 V
500 mA
300 V
BIAS
3
Value
50 V
10 V
2 μs
3.0
5 V
V
IN
= 3.3 V, C
Charge Time
3.5
Photoflash Capacitor Charger with IGBT Driver and Refresh
V
3.5
V
V
OUT
V
BATT
OUT
BATT
= 320 V
4
= 320 V
(V)
4.0
OUT
(V)
4.5
= 100 μF
C4
C1
C3
C2
TRIGGER
IGBTDRV
4.5
5
I
V
V
Primary
V
5.0
BATT
OUT
SW
5.5
IGBT Drive Timing Definition
5.5
6
50%
t
10%
Dr
6.0
Typical Switching Waveform
90%
t
r
50%
90
80
70
60
50
40
100
90%
t
Df
10%
t
f
150
t
V
BATT
200
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
= V
Efficiency
V
OUT
BIAS
(V)
, T
A
250
= 25°C
300
V
V
BATT
V
BATT
BATT
= 4.2 V
= 5.0 V
= 3.0 V
350
7