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www.powersolve.co.uk
Powersolve Electronics Ltd, Units 8, 9 and 12 The Paddock, Hambridge Road, Newbury, Berks RG14 5TQ
Tel: 01635 521858 Fax: 01635 523771 Email: sales@powersolve.co.uk
3
Derating:
The operating case temperature range of the PS50 series is -40°C to +100°C. When operating the PS50 series,
proper derating or cooling is needed.
The following curve is the derating curve of a PS50 without heat sink.
Where:
The power dissipation (Pd):
Pd = Pi - Po = Po (1-n) /n
The thermal resistance are listed below:
Chart of Thermal Resistance vs Air Flow:
The temperature rise (
T ):
T = Pd * Rca
Application Note
AIR FLOW RATE
TYPICAL Rca
Natural Convection 20ft./min. (0.1m/s)
7.12 °C/W
100 ft./min. (0.5m/s)
6.21 °C/W
200 ft./min. (1.0m/s)
5.17 °C/W
300 ft./min. (1.5m/s)
4.29 °C/W
400 ft./min. (2.0m/s)
3.64 °C/W
500 ft./min. (2.5m/s)
2.96 °C/W
600 ft./min. (3.0m/s)
2.53 °C/W
700 ft./min. (3.5m/s)
2.37 °C/W
800 ft./min. (4.0m/s)
2.19 °C/W
Power Dissipated vs Ambient Temperature and Air Flow
15
10
5
0
Ambient Temperature, Ta(Deg. C)
0
10
20
30
40
50
60
70
80
90
100
20
25
30
35
40
45
50
Natural Convection
20 ft./min. (0.1 m/s)
100 ft./min. (0.5 m/s)
200 ft./min. (1.0 m/s)
300 ft./min. ( 1.5 m/s)
400 ft./min. (2.0 m/s)
500 ft./min. (2.5 m/s)
600 ft./min. (3.0 m/s)
700 ft./min. (3.5 m/s)
800 ft./min. (4.0 m/s)
Forced Convection Power Derating without Heat Sink
High Density DC-DC Modules
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