AN2929 datasheet(16/32 Pages) STMICROELECTRONICS

16 / 32 page

Testing the board

AN2929

16/32

Doc ID 15333 Rev 2

Figure 16.

Input voltage averaged efficiency vs. load

In the version 2.0 of the ENERGY STAR® program requirement for single voltage external

AC-DC power supplies (see Section 4: References), the power supplies are divided in two

categories: low-voltage power supplies and standard power supplies with respect to the

nameplate output voltage and current. An external power supply, in order to be considered a

low-voltage power supply, needs to have a nameplate output voltage lower than 6 V and a

nameplate output current greater than or equal to 550 mA.

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

mode for standard models and for low-voltage models, respectively.

Table 10.

Energy efficiency criteria for standard models

Nameplate output power

(Pno)

Minimum average efficiency in active mode

(expressed as a decimal)

0 W < Pno ≤ 1 W

= 0.48 * Pno + 0.140

1 W < Pno ≤ 49 W

= [0.0626 * In (Pno)] + 0.622

Pno > 49 W

= 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 W < Pno ≤ 1 W

= 0.497 * Pno + 0.067

1 W < Pno ≤ 49 W

= [0.075 * In (Pno)] + 0.561

Pno > 49 W

= 0.860

AM02180v1

65.00

70.00

75.00

80.00

85.00

OUT (W )

Efficiency

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