Datasheet

4
LT1070/LT1071
10701fe
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Switch Current Limit vs Duty Cycle
DUTY CYCLE (%)
0
SWITCH CURRENT (A)
16
14
12
10
8
6
4
2
0
80
1070/71 G01
20 40 60 1007010 30 50 90
FOR LT1071, DIVIDE
VERTICAL SCALE BY 2
–55°C
125°C
25°C
Flyback Blanking Time
JUNCTION TEMPERATURE (°C)
–75
1.0
TIME (µs)
1.2
1.6
1.8
2.0
–25
25
50 150
1070/71 G03
1.4
–50 0
75
100
125
2.2
JUNCTION TEMPERATURE (°C)
–75
90
DUTY CYCLE (%)
91
93
94
95
–25
25
50 150
1070/71 G02
92
–50 0
75
100
125
96
Maximum Duty Cycle
Minimum Input Voltage
TEMPERATURE (°C)
–75
2.3
MINIMUM INPUT VOLTAGE (V)
2.4
2.6
2.7
2.8
–25
25
50 150
1070/71 G04
2.5
–50 0
75
100
125
2.9
SWITCH CURRENT = 5A
SWITCH CURRENT = 0A
Switch Saturation Voltage
SWITCH CURRENT (A)
0
SWITCH SATURATION VOLTAGE (V)
0.8
1.2
8
1070/71 G05
0.4
0
1.0
25°C
1.4
0.6
0.2
2
4
6
1
3
5
7
1.6
FOR LT1071, DIVIDE
CURRENT BY 2
100°C
–55°C
150°C
TEMPERATURE (°C)
–75
FLYBACK VOLTAGE (V)
19
20
21
125
1070/71 G06
18
17
15
–25 25 75–50 1500 50 100
16
23
22
R
FEEDBACK
= 500Ω
R
FEEDBACK
= 1k
R
FEEDBACK
= 10k
Line Regulation
Feedback Bias Current
vs Temperature
INPUT VOLTAGE (V)
0
–5
REFERENCE VOLTAGE CHANGE (mV)
–3
–1
1
10
20
30 40
1070/71 G07
50
3
5
–4
–2
0
2
4
60
T
J
= 150°C
T
J
= 25°C
T
J
= –55°C
TEMPERATURE (°C)
–75
FEEDBACK BIAS CURRENT (nA)
600
500
400
300
200
100
0
125
1070/71 G09
–25 25 75–50 1500 50 100
800
700
Reference Voltage
vs Temperature
TEMPERATURE (°C)
–75
REFERENCE VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
1.246
1.244
1.242
1.240
1.238
1.236
1.234
125
1070/71 G08
–25 25 75–50 1500 50 100
1.250
1.248
40
39
38
37
36
35
34
42
41
SWITCHING
FREQUENCY
REFERENCE
V0LTAGE