NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055
1.02
NORMALIZED CURRENT LIMIT
SUPPLY THRESHOLD (V)
1.00
0.98
0.96
0.94
0.92
0.90
0.88
−50 −25
0
25
50
75
100
125
150
8.6
8.4
8.2
8.0
7.8
7.6
7.4
7.2
−50 −25
0
25
50
75
100
125
150
MINIMUM
OPERATING
THRESHOLD
V
CC(off)
STARTUP
THRESHOLD
V
CC(on)
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 17. Normalized Peak Current Limit
versus Temperature
Figure 18. Supply Voltage Thresholds versus
Temperature
4.56
UNDERVOLTAGE THRESHOLD (V)
4.54
START CURRENT (mA)
4.52
4.50
4.48
4.46
4.44
4.42
4.40
4.38
4.36
4.34
−50
8
7
V
CC
= 0 V
6
5
4
3
2
V
PIN 5
= 20 V
1
−25
0
25
50
75
100
125
150
0
−50 −25
0
25
50
75
100
125
150
V
CC
= 8.3 V
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 19. Undervoltage Lockout Threshold
versus Temperature
Figure 20. Start Current versus Temperature
7
STARTUP CURRENT (mA)
STARTUP CURRENT (mA)
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
8
9
SUPPLY VOLTAGE (V)
T
J
= 25°C
V
PIN 5
= 20 V
8
V
CC
= 0 V
6
V
CC
= 8 V
4
2
0
T
J
= 25°C
−2
1
10
100
1000
PIN 5 VOLTAGE (V)
Figure 21. Startup Current versus Supply
Voltage
Figure 22. Startup Current versus Pin 5
Voltage
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