lt3825 Linear Technology Corporation, lt3825 Datasheet - Page 5

• Manufacturer Part Number: lt3825
• Description: Isolated No-opto Synchronous Flyback Controller With Wide Input Supply Range
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
1700
1650
1600
1550
1500
1450
1400
1350
1300
1250
1200
1150
1100
–10
–70
–30
–50
23
22
21
20
19
18
17
16
15
70
50
30
10
–50
–50
0.9
Feedback Amplifi er Output
Current vs V
Feedback Amplifi er Voltage Gain
vs Temperature
Soft-Start Charge Current
vs Temperature
–25
–25
1
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
1.1
FB
25
25
V
FB
1.2
(V)
50
50
125°C
1.3
75
75
–40°C
1.4
100
100
25°C
3825 G13
3825 G16
3825 G10
125
125
1.5
1.250
1.245
1.235
1.230
1.225
1.220
1.240
70
65
40
80
70
60
50
40
30
20
10
60
55
50
45
0
–50
–50
0
Feedback Amplifi er Source and
Sink Current vs Temperature
UVLO vs Temperature
PG, SG Rise and Fall Times
vs Load Capacitance
T
A
= 25°C
1
–25
–25
2
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
3
CAPACITANCE (nF)
FALL TIME
SOURCE CURRENT
4
25
25
5
50
50
V
FB
6
RISE TIME
= 1.1V
75
7
75
V
CURRENT
FB
8
SINK
100
100
= 1.4V
3825 G11
3825 G14
3825 G17
9
125
125
10
1050
1100
1000
21.5
21.0
20.5
20.0
19.5
19.0
950
900
3.7
3.4
3.3
3.2
3.0
3.6
3.5
3.1
–50
–50
–50 –25
Feedback Amplifi er g
vs Temperature
I
V
vs Temperature
UVLO
I
CC
CC
–25
–25
= 10mA
Clamp Voltage
Hysteresis vs Temperature
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
25
50
50
50
LT3825
m
75
75
75
100
100
100
3825 G12
3825 G15
3825 G18
3825fa
5
125
125
125