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EPS2U Power Supply Design Guide, V2.1
5 AC Input Requirements
STATUS
Required
The power supply shall incorporate universal power input with active power factor correction, which shall reduce
line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standards.
5.1 AC Inlet Connector
STATUS
Required
The AC input connector shall be an IEC 320 C-14 power inlet. This inlet is rated for 15 A/250 VAC.
5.2 AC Input Voltage Specification
STATUS
Required
The power supply must operate within all specified limits over the following input voltage range. Harmonic
distortion of up to 10% THD must not cause the power supply to go out of specified limits. The power supply shall
operate properly at 85 VAC input voltage to guarantee proper design margins.
Table 2: AC Input Rating
PARAMETER MIN RATED MAX
Voltage (110) 90 V
rms
100-127 V
rms
140 V
rms
Voltage (220) 180 V
rms
200-240 V
rms
264 V
rms
Frequency 47 Hz 63 Hz
5.3 Efficiency
STATUS
Recommended
The following efficiency requirements are provided as a recommendation to allow for proper power supply cooling
when installed in a system.
Table 3: Efficiency
Power Level Efficiency Airflow (reference)
480W 68% 20 CFM
550W 68% 20 CFM
600W 72% 20 CFM
650W 72% 20 CFM
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