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LT1082IT Datasheet(PDF) 6 Page - Linear Technology

Part # LT1082IT
Description  1A High Voltage, Efficiency Switching Voltage Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1082IT Datasheet(HTML) 6 Page - Linear Technology

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6
LT1082
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
VC Pin Characteristics
FREQUENCY (Hz)
1k
100k
1M
10M
1082 G24
10k
7000
6000
5000
4000
3000
2000
1000
0
–1000
θ
gm
–30
0
30
60
90
120
150
180
210
Error Amplifier Transconductance
TEMPERATURE (°C)
–75 –50
50
100
1082 G18
25
150
–25
0
75
125
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
gm =
∆I
∆V
(VC PIN)
(FB PIN)
Idle Supply Current vs
Temperature
TEMPERATURE (°C)
1082 G20
10
9
8
7
6
5
4
3
2
1
–75 –50
50
100
25
150 175
–25 0
75
125
VC = 0.6V
VIN = 75V
VIN = 3V
TEMPERATURE (°C)
1082 G19
400
350
300
250
200
150
100
50
0
–75 –50
50
100
25
150 175
–25 0
75
125
–400
–350
–300
–250
–200
–150
–100
–50
0
VOLTAGE AT VC PIN
CURRENT
(OUT OF VC PIN)
Shutdown Thresholds
Feedback Pin Clamp Voltage
SWITCH VOLTAGE (V)
500
450
400
350
300
250
200
150
100
50
0
1082 G22
0
10
50
70
40
90 100
20 30
60
80
A. VIN = 3V
B. VIN = 15V
C. VIN = 40V
D. VIN = 55V
E. VIN = 75V
AB
DE
C
FEEDBACK CURRENT (mA)
0
800
700
600
500
400
300
200
0.1
1082 G21
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
TJ = –55°C
TJ = 25°C
TJ = 150°C
Switch “Off” Characteristics
Transconductance of Error
Amplifier
V C PIN VOLTAGE (V)
400
300
200
100
0
–100
–200
–300
–400
1082 G23
0
1.0
2.5
0.5
1.5
2.0
VFB = 0.8V
(CURRENT OUT OF VC PIN)
VFB = 1.5V
(CURRENT INTO VC PIN)
TJ = 25°C


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