ncp3170 ON Semiconductor, ncp3170 Datasheet - Page 8

• Manufacturer Part Number: ncp3170
• Description: Ncp3170 Synchronous Pwm Switching Converter
• Manufacturer: ON Semiconductor

NCP3170A Efficiency and Thermal Derating
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 < 50LFM) unless otherwise specified.
100
5
4
3
2
1
0
90
80
70
60
50
40
30
20
10
25
0
0
Figure 22. 500 kHz Derating Curves at 5 V
Figure 20. Efficiency (V
V
35
o
= 1.2 V
T
A
, AMBIENT TEMPERATURE (°C)
1.2 V, 1.8 V,
V
OUTPUT CURRENT (A)
3.3 V
45
o
1
= 1.8 V
Current
55
V
o
= 3.3 V
IN
= 12 V) vs. Load
65
2
12 V, 500 kHz
Efficiency
V
o
75
= 5 V
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85
3
8
100
90
80
70
60
50
40
30
20
10
5
4
3
2
1
0
0
25
0
Figure 21. Efficiency (V
Figure 23. 500 kHz Derating Curves at 12 V
V
o
35
= 1.2 V
T
A
, AMBIENT TEMPERATURE (°C)
OUTPUT CURRENT (A)
1.2 V, 1.8 V,
3.3 V, 5.0 V
45
1
V
55
o
IN
= 1.8 V
= 5 V) vs. Load Current
65
2
5 V, 500 kHz
V
Efficiency
o
= 3.3 V
75
85
3