Powersolve PS200 Series - Manual (Page 3)

Powersolve Electronics Ltd. 8A Arnhem Road, Newbury, RG14 5RU. England
Tel: 01635 521858 Fax: 01635 523771 Email: [email protected]
www.powersolve.co.uk
High Density DC-DC Modules
Application Note
Derating:
The case operating temperature range of the PS200 series is -40°C to +100°C. When operating the PS200 series, proper derating or
cooling is required.
Following is the derating curve for the PS200 without a heatsink; airflow along width (transverse).
Where:
The power dissipated (Pd):
Pd = Pi - Po = Po (1-n) / n
The thermal resistances are listed below:
Chart of Thermal Resistance vs Air Flow:
AIR FLOW RATE TYPICAL Rca
Natural Convection 20ft/min. (0.1m/s) 3.82°C/W
100ft./min. (0.5m/s) 3.23°C/W
200ft./min. (1.0m/s) 2.71°C/W
300ft./min. (1.5m/s) 2.28°C/W
400ft./min. (2.0m/s) 1.92°C/W
500ft./min. (2.5m/s) 1.68°C/W
600ft./min. (3.0m/s) 1.50°C/W
700ft./min. (3.5m/s) 1.35°C/W
800ft./min. (4.0m/s) 1.23°C/W
The temperature rise (∆T):
∆T = Pd * Rca