NCP3170
NCP3170A Efficiency and Thermal Derating
100
90
80
70
60
50
40
30
20
10
100
90
80
V = 5 V
o
V = 1.8 V
o
V = 3.3 V
V = 3.3 V
o
o
70
V = 1.2 V
o
V = 1.8 V
o
60
V = 1.2 V
o
50
40
30
20
10
0
12 V, 500 kHz
Efficiency
5 V, 500 kHz
Efficiency
0
0
1
2
3
0
1
2
3
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 20. Efficiency (VIN = 12 V) vs. Load
Current
Figure 21. Efficiency (VIN = 5 V) vs. Load Current
Thermal derating curves for the SOIC−8 package part under typical input and output conditions based on the evaluation board.
The ambient temperature is 25°C with natural convection (air speed < 50 LFM) unless otherwise specified.
5
4
3
2
1
0
5
4
3
2
1
0
1.2 V, 1.8 V,
3.3 V
1.2 V, 1.8 V,
3.3 V, 5.0 V
25
35
45
55
65
75
85
25
35
45
55
65
75
85
T , AMBIENT TEMPERATURE (°C)
A
T , AMBIENT TEMPERATURE (°C)
A
Figure 22. 500 kHz Derating Curves at 5 V
Figure 23. 500 kHz Derating Curves at 12 V
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