LT3420 LINER [Linear Technology], LT3420 Datasheet - Page 16

• Manufacturer Part Number: LT3420
• Description: Photoflash Capacitor Chargers with Automatic Refresh
• Manufacturer: LINER [Linear Technology]

LT3420/LT3420-1
16
TYPICAL APPLICATIO S
Professional Charger uses Multiple LT3420 Circuits in Parallel to Charge Large Photoflash Capacitors Quickly
C1, C2, C4, C5, C6, C7: 4.7 F, X5R or X7R, 10V
T1-T3: PULSE PA0367 FLYBACK TRANSFORMER
D1-D3: GENERAL SEMICONDUCTOR GSD2004S SOT-23
Q1: 2N3904 OR EQUIVALENT
* CAN CHARGE ANY SIZE PHOTOFLASH CAPACITOR
** USE AS MANY SLAVE CHARGERS AS NEEDED.
DUAL DIODE. DIODES CONNECTED IN SERIES
DANGER HIGH VOLTAGE
OPERATION BY HIGH VOLTAGE
TRAINED PERSONEL ONLY
U
V
CC
Q1
2N3904
R3
100k
R4
100k
2.5V TO 10V
1.8V TO 6V
CHARGE
V
V
V
V
V
BAT
BAT
BAT
CC
CC
C1
4.7 F
C2
4.7 F
C4
4.7 F
C5
4.7 F
C6
4.7 F
C7
4.7 F
0.1 F
C3
4
9
8
4
9
8
4
9
8
V
V
V
V
CHARGE
DONE
V
CHARGE
DONE
V
CHARGE
DONE
C
C
C
BAT
BAT
BAT
CC
CC
CC
T
T
T
2
10
2
10
2
10
LT3420
LT3420
LT3420
R
R
R
FB
FB
FB
3
3
3
R1
52.3k
2
2
2
3
R
3
R
3
R
GND
GND
GND
SW
SEC
SW
SEC
SW
SEC
REF
REF
REF
6
5
6
5
6
5
1
1
1
SLAVE**
CHARGER
SLAVE**
CHARGER
MASTER
CHARGER
1
7
1
7
1
1
7
4
4
4
T3
1:12
T1
1:12
T2
1:12
R2
2k
3420 TA01
D2
D3
D1
+
650 F*
350V
PHOTOFLASH
CAPACITOR
320V
3420fa