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TFX12V Power Supply Design Guide
Thin Form Factor with 12-V Connector
Version 2.0
35
4 Environmental
The following subsections define recommended environmental specifications and test parameters, based on
the typical conditions a TFX12V power supply unit may be subjected to during operation or shipment.
4.1 Temperature
Operating ambient: +10 °C to +50 °C (At full load, with a maximum temperature rate of change of 5 °C/10
minutes, but no more than 10 °C/hr.)
Non-operating ambient: -40 °C to +70 °C (Maximum temperature rate of change of 20 °C/hr
.)
4.2 Thermal Shock (Shipping)
Non-operating: -40 °C to +70 °C
15 °C/min ≤ Dt/dt ≤ 30 °C/min. Tested for 50 cycles; Duration of exposure to temperature extremes for
each half cycle shall be 30 minutes.
4.3 Relative Humidity
Operating: To 85% relative humidity (non-condensing)
Non-operating: To 95% relative humidity (non-condensing)
Note: 95% RH is achieved with a dry bulb temperature of 55 °C and a wet bulb temperature of 54 °C.
4.4 Altitude Requirement
Operating: To 10,000 ft
Non-operating: To 50,000 ft
4.5 Mechanical Shock
Non-operating: 50 g, trapezoidal input; velocity change ≥ 170 in/s
Three drops on each of six faces are applied to each sample.