LT1082 Linear Technology, LT1082 Datasheet - Page 5

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

TYPICAL PERFOR
800
700
600
500
400
300
200
100
200
160
120
25
24
23
22
21
20
19
18
17
16
15
80
40
0
0
–75 –50
–75 –50
Feedback Bias Current vs
Temperature
0
Isolated Mode Flyback
Reference Voltage
Supply Current vs Supply Voltage
(Shutdown Mode)
10
–25 0
–25 0
20
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
C
30
V
25
25
= 50mV
C
R
R
R
FB
= 0V
FB
FB
50
50
40
= 10k
= 3k
= 6k
75
75
50
100
100
60
W
125
125
A
70
150 175
150 175
1082 G12
1082 G09
1082 G15
U
80
CE
750
725
700
675
650
625
600
575
550
525
500
C
70
65
60
55
50
45
–75 –50
–75 –50
HARA TERISTICS
100
Reference Voltage and Switching
Frequency vs Temperature
Normal/Feedback Mode
Threshold on Feedback Pin
90
80
70
60
50
40
30
20
10
* AVERAGE SUPPLY CURRENT
= I
FEEDBACK PIN VOLTAGE
FEEDBACK PIN CURRENT
0
I
I
Q
SW
0
Driver Current* vs Switch Current
Q
= QUIESCENT CURRENT, DC = DUTY CYCLE,
(AT THRESHOLD)
(AT THRESHOLD)
+ DC(2.9 + 10
= SWITCH CURRENT
–25 0
0.2
–25 0
0.4 0.6
C
TEMPERATURE (°C)
TEMPERATURE (°C)
SWITCH CURRENT (A)
FREQ
V
25
25
REF
–2
0.8
50
50
I
SW
1.0
75
75
+ 10
1.2
100
100
–5
I
SW
125
1.4
125
2
)
1.6
150 175
150 175
1082 G11
1082 G16
1.8 2.0
1082 G13
1.250
1.245
1.240
1.235
1.230
1.225
–24
–22
–20
–18
–16
–14
–12
–10
–8
–6
–4
**UNDER VERY LOW OUTPUT CURRENT CONDITIONS,
200
180
160
140
120
100
–1
–2
–3
–4
–5
80
60
40
20
14
13
12
11
10
DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH
10% OR LESS.
5
4
3
2
1
0
9
8
7
6
5
4
3
2
0
0
0
Supply Current vs Input Voltage**
Shutdown Mode Supply Current
Line Regulation
0
T
J
10
10
10
= –55°C
T
T
20 30
J
J
20
= 150°C
= 25°C
20
V
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
C
PIN VOLTAGE (mV)
30
30
40
–55°C T
40
40
50
90% DUTY CYCLE
50% DUTY CYCLE
10% DUTY CYCLE
0% DUTY CYCLE
60
50
50
J
T
LT1082
J
70
125°C
= 150°C
60
60
80
70
70
1082 G10
90 100
1082 G17
5
1082 G14
80
80