Chapter 4
250W ATX Power Supply
This specification defines the performance characteristics of a
grounded, single-phase, 250 watts, 6 output levels power supply. This
specification also defines worldwide safety requirements and
manufactures process test requirements.
4.1 Specifications
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Input Voltage: 90~135VAC (input 115VAC); 180~260VAC (input
230VAC)
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Input Frequency: The input frequency range will be 47Hz~63Hz
Input Current: 7A for 115VAC at without AC outlet; 3.5A for 230VAC
Inrush Current: 70A max. at cold start
Switching Frequency: 30KHz typical
Hold Up Time: 16ms min.
Brown Out Voltage: 95VAC max. at 60Hz
Output Power: 250W at 45°C
Power Up Time: <20ms for +5V output voltage
Power Good Signal: The power good signal will not be higher than
100~500ms after the +5V output stabilizes at its operating value when
the unit is turned on
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Power Failure: The TTL compatible signal will go down at least 1ms
before +5V below 4.75V
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PS ON Signal: TTL compatible signal (active low)
Efficiency: 75% min. at full load (AC input 230V)
Altitude: 10,000 feet
Over Voltage Protection: +3.3V from 3.8~4.3V, +5V from 5.7~7V,
+12V from 13.4~15.6V
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Over Load Protection: Total output from 130% min. to 150% max.
Short Circuit Protection: Latch Off
Thermal System: Forced air ventilation by DC ball bearing cooling fan,
fan status monitoring is optional
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Temperature Coefficient: +0.05% per°C
Temperature: 0~50°C (operating); -10~+70°C (storage)
Humidity: 20~90% RH (operating); 10~98% RH (storage)
Dimensions: 15.0 x 14.0 x 8.6 cm
MTBF: 100,000 hrs.
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