ncp3170 ON Semiconductor, ncp3170 Datasheet - Page 9

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

NCP3170B 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 < 50 LFM) unless otherwise specified.
100
90
80
70
60
50
40
30
20
10
5
4
3
2
1
0
0
25
0
Figure 26. 1 MHz Derating Curves at 5 V Input
Figure 24. 12 V, 1 MHz Efficiency
V
o
35
= 1.2 V
T
A
, AMBIENT TEMPERATURE (°C)
OUTPUT CURRENT (A)
45
V
1
o
= 1.8 V
55
V
o
= 3.3 V
65
2
12 V, 1 MHz
Efficiency
V
75
o
3.3 V
= 5 V
1.2 V,
1.8 V
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85
3
9
100
90
80
70
60
50
40
30
20
10
5
4
3
2
1
0
0
25
0
Figure 27. 1 MHz Derating Curves at 12 V Input
V
o
35
= 1.2 V
Figure 25. 5 V, 1 MHz Efficiency
T
A
, AMBIENT TEMPERATURE (°C)
OUTPUT CURRENT (A)
45
1
V
55
o
= 1.8 V
65
2
1.2 V,
1.8 V
3.3 V
V
o
5 V, 1 MHz
5.0 V
Efficiency
= 3.3 V
75
85
3