LT1082_1 Datasheet, PDF (6/12 Pages) Linear Integrated Systems – 1A High Voltage, Efficiency Switching Voltage Regulator

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