LT1082 Linear Technology, LT1082 Datasheet - Page 4

• Manufacturer Part Number: LT1082
• Description: 1A High Voltage/ Efficiency Switching Voltage Regulator
• Manufacturer: Linear Technology

LT1082
TYPICAL PERFOR
4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
70
60
50
40
30
20
10
0
–75
0
Flyback Blanking Time
Suggested Core Size and
Inductance for Telecom
5V Supply
Short-Circuit Frequency
Shift-Down vs Feedback Current
LOAD
CURRENT
100mA
200mA
400mA
600mA
800mA
T
T
–50
A
A
100 200
= 0°C
= 150°C
JUNCTION TEMPERATURE (°C)
–25
FEEDBACK CURRENT ( A)
0
300
TYPE 52
POWDERED
IRON
T38 250 H
T50 250 H
T60 250 H
T60 250 H
T80 350 H
25
400 500 600 700
T
A
50
= –55°C
75
KOOL M
OR MOLY-
PERMALLOY
T38 200 H
T38 150 H
T50 150 H
T50 200 H
T80 350 H
100
W
125
A
1082 G06
1082 GA
1082 G03
U
150
800
CE
C
HARA TERISTICS
NOTE: THIS GRAPH IS BASED ON LOW CORE LOSS
PERMALLOY INDUCTOR. IF POWDERED IRON CORE
INDUCTOR IS USED, THE CORE LOSS IS TYPICALLY
100mW HIGHER.
2.9
2.8
2.7
2.6
2.5
2.4
2.3
79
76
73
70
67
64
61
58
55
4
3
2
0
–75
1
Minimum Input Voltage
0
Switch Current Limit
0
Telecom 5V Supply Efficiency
V
–50
V
V
V
10 20 30
IN
IN
IN
IN
= –60V
= –70V
= –20V
= –40V
T
–25
T
J
J
C
= –55°C
= 150°C
1
POWER OUTPUT (W)
TEMPERATURE (°C)
0
DUTY CYCLE (%)
40
25
T
50 60 70 80 90 100
I
I
2
SW
J
SW
= 25°C
50
= 1A
= 0A
75
L = 250 H
R = 0.08
100
3
125
1082 G07
1082 G04
1082 G01
150
4
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
80
70
60
50
40
30
20
10
97
96
95
94
93
92
91
90
0
0
–75
6
0
Switch Saturation Voltage
Telecom 5V Supply Short-Circuit
Frequency Shift-Down
Maximum Duty Cycle
T
–50
A
0.25 0.50
= 25°C
5
–25 0
OUTPUT VOLTAGE (V)
SWITCH CURRENT (A)
TEMPERATURE (°C)
4
0.75 1.00 1.25
T
J
T
25
J
= 100°C
= 25°C
50
3
T
T
J
J
75
= 150°C
= –50°C
2
100
1.50
125
1
1.75
150 175
1082 G02
1082 G08
1082 G05
2.00
0