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ENERGY STAR EPS Specification Version 2.0

ENERGY STAR has published its Version 2.0 specification for external power supplies (EPS). The effective date is November 1, 2008.

Notable changes in the specification include:

  • Increased active mode energy efficiency minimum requirements
  • Reduced no-load power max limits
  • Power factor correction requirement added for power supplies with input power ≥ 100 watts
  • No-load requirements for AC-DC and AC-AC are separated

The test methodology is unchanged, and compliance is voluntary The following tables show active mode energy efficiency and no-load power consumption specifications in the final draft.

EPS Active Mode Efficiency: Standard Models

Nameplate Output Power (Pno) Minimum Average Efficiency in Active Mode (expressed as a decimal, rounded to hundreths)
0 to ≤ 1 watt ≥ 0.480 * Pno+ 0.140
> 1 watt to ≤ 49 watts ≥ [0.0626 * Ln (Pno)] + 0.622
> 49 watts ≥ 0.870

EPS Active Mode Efficiency: Low Voltage* Models

Nameplate Output Power (Pno) Minimum Average Efficiency in Active Mode (expressed as a decimal, rounded to hundreths)
0 to ≤ 1 watt ≥ 0.497 * Pno+ 0.067
> 1 watt to ≤ 49 watts ≥ [0.0750 * Ln (Pno)] + 0.561
> 49 watts ≥ 0.860

* A low voltage model is an EPS with a nameplate output voltage of less than 6 volts and a nameplate output current greater than or equal to 550 milliamps

No-load Energy Consumption

Nameplate Output Power (Pno) Maximum Power for No-load
AC-AC EPS AC-DC EPS
0 to < 50 watts ≤ 0.5 watts ≤ 0.3 watts
≥ 50 to ≤ 250 watts ≤ 0.5 watts ≤ 0.5 watts

Conforming Design Ideas from Power Integrations

The following table shows Power Integrations Design Ideas that meet the spec.

Document Device
Used		 Power Output (W) Efficiency
(4 Points
Average) *		 CEC
2008 †		 ENERGY
STAR 2.0 ‡

DI-85

 LNK564PN 2 64.8% 56.2% 61%
DI-113 TNY274PN 5 71.5% 59.9% 68%
DI-115 TNY376PN 7.5 / 13 Pk 77.7% 68.1% 75%
DI-132 LNK564DN 1.75 64.0% 55.0% 60%
DI-143 TOP258MN 20 / 80 Pk 85% 77% 81%
DI-144 TOP258PN 50 / 70 Pk 89.9% 84% 87%

* The actual measurement of the average efficiency of the design idea at the 4 test points of load: 25%, 50%, 75% and 100%, as called for by CEC and ENERGY STAR specs

† The California Energy Commission standard that will become effective in July, 2008

‡ Minimum average efficiency called for by EPS V. 2.0 spec

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