LT3420 LINER [Linear Technology], LT3420 Datasheet - Page 4

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

LT3420/LT3420-1
Graphs apply to both the LT3420 and LT34201-1 unless otherwise noted.
4
TYPICAL PERFOR A CE CHARACTERISTICS
335
330
325
320
315
310
305
300
295
10
90
80
70
60
50
40
8
6
4
2
0
–50
50
2
Output Voltage in Refresh Mode,
LT3420-1
Charge Pin Input Current
Efficiency of Figure 1 Circuit,
LT3420
T
T
A
A
= 25 C
–25
= 25 C
3
100
CHARGE PIN VOLTAGE (V)
V
4
IN
0
TEMPERATURE ( C)
150
= 3.3V
5
V
25
OUT
200
6
(V)
V
50
IN
V
FIGURE 2 CIRCUIT
V
V
CC
= 5V
CC
BAT
7
250
= V
= 3.3V
75
= 3.3V
8
BAT
W
300
100
= V
9
3420 G04
3420 G07
3420 G10
IN
U
125
10
350
335
330
325
320
315
310
305
300
295
1.7
1.5
1.3
1.1
0.9
1.2
1.1
1.0
0.9
0.8
–50
–50
2.5
Primary Current Limit, LT3420
Primary Current Limit, LT3420-1
Output Voltage in Refresh Mode,
LT3420-1
–25
–25
3.0
3.5
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
4.0
25
25
V
IN
(V)
4.5
50
50
FIGURE 2 CIRCUIT
V
V
T
CC
BAT
A
= 25 C
= V
5.0
75
75
= V
IN
IN
100
100
5.5
3420 G05
3420 G08
3420 G11
125
125
6.0
10
60
55
50
45
40
35
30
25
20
35
30
25
20
15
10
8
6
4
2
0
5
–50
–50
2
Secondary Current Limit, LT3420
Secondary Current Limit, LT3420-1
Charge Time, LT3420-1
–25
–25
3
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
C
OUT
C
25
25
V
OUT
= 40 F
BAT
4
= 100 F
(V)
50
50
FIGURE 2 CIRCUIT
V
FROM 50V TO 320V
T
A
OUT
= 25 C
CHARGED
75
75
5
100
100
3420 G09
3420 G12
3420 G06
3420fa
125
125
6