Intel ERP2U manual AC Line Transient Specification, AC Line Fast Transient Specification

SSI

ERP2U Power Supply Design Guide, V1.0

5.8AC Line Transient Specification

STATUS

Recommended

AC line transient conditions shall be defined as “sag” and “surge” conditions. Sag conditions (also referred to as “brownout” conditions) will be defined as the AC line voltage dropping below nominal voltage. Surge conditions will be defined as the AC line voltage rising above nominal voltage.

The power supply shall meet the requirements under the following AC line sag and surge conditions.

Table 4: AC Line Sag Transient Performance

AC Line Sag

Duration	Sag	Operating AC Voltage	Line Frequency	Performance Criteria
Continuous	10%	Nominal AC Voltage ranges	50/60 Hz	No loss of function or performance
0 to 1 AC	100%	Nominal AC Voltage ranges	50/60 Hz	No loss of function or performance
cycle
>1 AC cycle	>10%	Nominal AC Voltage ranges	50/60 Hz	Loss of function acceptable, self
				recoverable

Table 5: AC Line Surge Transient Performance

AC Line Surge

Duration	Surge	Operating AC Voltage	Line Frequency	Performance Criteria
Continuous	10%	Nominal AC Voltages	50/60 Hz	No loss of function or performance
0 to ½ AC	30%	Mid-point of nominal AC	50/60 Hz	No loss of function or performance
cycle		Voltages

5.9AC Line Fast Transient Specification

STATUS

Recommended

The power supply shall meet the EN61000-4-5directive and any additional requirements in IEC1000-4-5:1995and the Level 3 requirements for surge-withstand capability, with the following conditions and exceptions:

∙These input transients must not cause any out-of-regulation conditions, such as overshoot and undershoot, nor must it cause any nuisance trips of any of the power supply protection circuits.

∙The surge-withstand test must not produce damage to the power supply.

∙The supply must meet surge-withstand test conditions under maximum and minimum DC-output load conditions.

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