Intel ATX Power Supply Design Guide

Version 0.9

5. Environmental Requirements

5.1 Temperature

 

 

Operating ambient

+10

°C min

 

+50

°C max

 

(At full load, with a maximum rate of change of 5 °C/10

 

minutes, but no more than 10 °C/hr.)

Nonoperating ambient

-40 °C to +70 °C

(Maximum rate of change of 20 °C/hr.)

5.2 Thermal Shock (Shipping)

Nonoperating

-40 °C to +70 °C; 15 °C/min dT/dt 30 °C/min; 50 cycles;

 

Duration of exposure to temperature extremes for each half

 

cycle shall be 30 minutes.

5.3 Humidity

 

Operating

To 85% relative humidity (noncondensing)

Nonoperating

To 95% relative humidity (noncondensing)

 

Note: 95% RH is achieved with a dry bulb temperature of

 

55 °C and a wet bulb temperature of 54 °C.

5.4

Altitude

 

 

Operating

To 10,000 ft

 

Nonoperating

To 50,000 ft

5.5

Mechanical Shock

 

Nonoperating

50 g, trapezoidal input; velocity change 170 in/s.

 

 

Three drops on each of six faces are applied to each sample.

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