Electrical; Ac Input - Required; Input Over Current Protection - Required; Inrush Current - Required - Intel ATX Design Manual

3

Electrical

The following electrical requirements are required and must be met over the
environmental ranges as defined in
3.1

AC Input - Required

The below table lists AC input voltage and frequency requirements for continuous
operation. The power supply shall be capable of supplying full-rated output power over
two input voltage ranges rated 100-127 VAC and 200-240 VAC rms nominal. The
correct input range for use in a given environment may be either switch-selectable or
auto-ranging. The power supply shall automatically recover from AC power loss. The
power supply must be able to start up under full loading at 90 VAC.
Note: Optional - 115 VAC or 230 VAC only power supplies are an option for specific
geographical or other requirements.

Table 3-1: AC Input Line Requirements

Parameter
Vin (115 VAC)
Vin (230VAC)
Vin Frequency
NOTE: 1
3.1.1 Input Over Current Protection – Required
The power supply is required to incorporate primary fusing for input over current
protection to prevent damage to the power supply and meet product safety
requirements. Fuses should be slow-blow-type or equivalent to prevent nuisance trips.
3.1.2 Inrush Current – Required
Maximum inrush current from power-on (with power-on at any point on the AC sine)
and including, but not limited to, three line cycles, shall be limited to a level below the
surge rating of the AC switch if present, bridge rectifier, and fuse components.
Repetitive ON/OFF cycling of the AC input voltage should not damage the power supply
or cause the input fuse to blow.
3.1.3 Input Under Voltage – Required
The power supply is required to contain protection circuitry such that the application of
an input voltage below the minimum specified in the above table shall not cause
damage to the power supply.
14
Minimum
90
180
47
Nominal voltages for test purposes are considered to be within ±1.0 V of nominal.
Chapter 6 (unless otherwise noted).
Nominal 1
115
230
-
Electrical
Maximum Unit
135 VACrms
265 VACrms
63 Hz
Design Guide