Datasheet

6
LT1082
sn1082 1082fas
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
V
C
Pin Characteristics
FREQUENCY (Hz)
TRANSCONDUCTANCE (µmho)
1k 100k 1M 10M
1082 G24
10k
7000
6000
5000
4000
3000
2000
1000
0
–1000
θ
g
m
–30
0
30
60
90
120
150
180
210
PHASE (DEG)
Error Amplifier Transconductance
TEMPERATURE (°C)
–75
TRANSCONDUCTANCE (µmho)
–50
50
100
1082 G18
25
150
–25
0
75 125
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
g
m
=
∆I
∆V
(V
C
PIN)
(FB PIN)
Idle Supply Current vs
Temperature
TEMPERATURE (°C)
IDLE SUPPLY CURRENT (mA)
1082 G20
10
9
8
7
6
5
4
3
2
1
–75
–50
50
100
25
150
175
–25
0
75 125
V
C
= 0.6V
V
IN
= 75V
V
IN
= 3V
TEMPERATURE (°C)
V
C
VOLTAGE (mV)
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
V
C
CURRENT (µA)
VOLTAGE AT V
C
PIN
CURRENT
(OUT OF V
C
PIN)
Shutdown Thresholds
Feedback Pin Clamp Voltage
SWITCH VOLTAGE (V)
SWITCH CURRENT (µA)
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. V
IN
= 3V
B. V
IN
= 15V
C. V
IN
= 40V
D. V
IN
= 55V
E. V
IN
= 75V
AB
DE
C
FEEDBACK CURRENT (mA)
0
FEEDBACK VOLTAGE (mV)
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
T
J
= –55°C
T
J
= 25°C
T
J
= 150°C
Switch “Off” Characteristics
Transconductance of Error
Amplifier
V
C
PIN VOLTAGE (V)
V
C
PIN CURRENT (µA)
400
300
200
100
0
–100
–200
–300
–400
1082 G23
0
1.0
2.5
0.5
1.5 2.0
V
FB
= 0.8V
(CURRENT OUT OF V
C
PIN)
V
FB
= 1.5V
(CURRENT INTO V
C
PIN)
T
J
= 25°C