Powersolve PSQ75 Series Bedienungsanleitung PDF herunterladen (Seite 3)

Powersolve Electronics Ltd. Units 8A, Arnhem Road, Newbury, RG14 5RU. England

Tel:01635 521858 Fax: 01635 523771 Email: [email protected]

www.powersolve.co.uk

Derating:

The operating case temperature range of the PSQ75 series is -40°C to +100°C. When operating the PSQ75 series,

proper derating or cooling is needed.

The following curve is the derating curve of a PSQ75 without heat sink.

Where:

The power dissipation (Pd):

Pd = Pi - Po = Po (1-n) /n

The ther

mal r

esistance are listed below:

Chart of Thermal Resistance vs Air Flow:

The temperatur

e rise (

T ):

T = Pd * Rca

Application Note

AIR FLOW RA

TYPICAL Rca

Natural Convection 20ft./min. (0.1m/s) 10.1 °C/W

100 ft./min. (0.5m/s) 8.0 °C/W

200 ft./min. (1.0m/s) 5.4 °C/W

300 ft./min. (1.5m/s) 4.4 °C/W

400 ft./min. (2.0m/s) 3.4 °C/W

Power Dissipated vs Ambient Temperature and Air Flow

atural Convectio

20 ft./min. (0.1 m/s)

00 ft./min. (0.5 m/s)

00 ft./min. (1.0 m/s)

300 ft./min. ( 1.5 m/s)

400 ft./min. (2.0 m/s)

10 20

40 50

70 80 90

100

Ambient Temperature, Ta(Deg. C)

Power Disspated, Pd (Watts)

External Output

High Density DC-DC Modules

1 2 3 4

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