AN2864 datasheet(18/29 Pages) STMICROELECTRONICS

18 / 29 page

Testing the board

AN2864

18/29

Doc ID 15282 Rev 1

Figure 17.

VIN average vs. load efficiency

In version 2.0 of the ENERGY STAR® program requirements for single voltage external AC-

DC power supplies [2], the power supplies are divided into two categories: low voltage

power supplies and standard power supplies according to the nameplate output voltage and

current. In order to be considered a low voltage power supply, an external power supply

must have a nameplate output voltage lower than 6 V and a nameplate output current higher

than or equal to 550 mA.

The tables below report the EPA energy efficiency criteria for AC-DC power supplies in

active mode for standard and low voltage models.

Table 10.

Energy efficiency criteria for standard models

Nameplate output power

(Pno)

Minimum average efficiency in active mode

(expressed as a decimal)

0 to

≤ 1 watt

≥ 0.48*Pno+0.140

> 1 to

≤ 49 watts

≥ [0.0626 * In (Pno)] + 0.622

> 49 watts

≥ 0.870

Table 11.

Energy efficiency criteria for low voltage models

Nameplate output power

(Pno)

Minimum average efficiency in active mode

(expressed as a decimal)

0 to

≤ 1 W

≥ 0.497 *P

no + 0.067

> 1 to

≤ 49 W

≥ [0.075 * In (P

no)] + 0.561

> 49 W

≥ 0.860

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