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LT1082_15 Datasheet, PDF (5/12 Pages) Linear Technology – 1A High Voltage, Efficiency Switching Voltage Regulator | |||
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TYPICAL PERFOR A CE CHARACTERISTICS
LT1082
Isolated Mode Flyback
Reference Voltage
25
24
23
RFB = 3k
22
21
20
RFB = 6k
19
RFB = 10k
18
17
16
15
â75 â50 â25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G09
Feedback Bias Current vs
Temperature
800
700
600
500
400
300
200
100
0
â75 â50 â25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G12
Supply Current vs Supply Voltage
(Shutdown Mode)
200
160
VC = 50mV
120
80
VC = 0V
40
0
0 10 20 30 40 50 60 70 80
SUPPLY VOLTAGE (V)
1082 G15
Reference Voltage and Switching
Frequency vs Temperature
70
1.250
65
VREF
FREQ
60
1.245
1.240
55
1.235
50
1.230
45
1.225
â75 â50 â25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G11
Normal/Feedback Mode
Threshold on Feedback Pin
750
â 24
725 FEEDBACK PIN VOLTAGE
â 22
700 (AT THRESHOLD)
â 20
675
â 18
650
â 16
625
â 14
600
â 12
575 FEEDBACK PIN CURRENT
â 10
(AT THRESHOLD)
550
â8
525
â6
500
â4
â75 â50 â25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
1082 G16
Line Regulation
5
4
3
2
1
0 TJ = â55°C
â1
â2
TJ = 150°C
â3
TJ = 25°C
â4
â5
0
10 20 30 40 50 60
INPUT VOLTAGE (V)
70 80
1082 G10
Shutdown Mode Supply Current
200
180
â55°C ⤠TJ ⤠125°C
160
140
TJ = 150°C
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
VC PIN VOLTAGE (mV)
1082 G17
Driver Current* vs Switch Current
100
90
80
70
60
50
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
SWITCH CURRENT (A)
* AVERAGE SUPPLY CURRENT
= IQ + DC(2.9 + 10â2ISW + 10 â5 ISW2)
IQ = QUIESCENT CURRENT, DC = DUTY CYCLE,
ISW = SWITCH CURRENT
1082 G13
Supply Current vs Input Voltage**
14
13
12
11
10
90% DUTY CYCLE
9
8
7
50% DUTY CYCLE
6
10% DUTY CYCLE
5
4
0% DUTY CYCLE
3
2
0 10 20 30 40 50 60 70 80
INPUT VOLTAGE (V)
**UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
1082 G14
sn1082 1082fas
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