AN3203 datasheet(22/49 Pages) STMICROELECTRONICS

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Electrical performance

AN3203

22/49

Doc ID 17402 Rev 2

Some measurements with low output loads were also taken. They refer only to the operation

of the auxiliary stage, while the other stages are off. Results are shown in Table 7 and

Table 8 and plotted in Figure 17. The standby consumption allows the US Executive Order

13221 - “1-Watt Standby” to be met. To be more precise, when the output power is reduced

to 0.5 W, the input power is lower than 1 W (efficiency greater than 50 %). This is a very

common requirement for power supply manufacturers.

Table 7.

Low load efficiency @ 115 Vrms

Vout [V]

Iout [A]

Pout [W]

Pin [W]

Eff [%]

4.993

0.1

0.499

0.688

72.6 %

4.993

0.2003

1.000

1.312

76.2 %

4.993

0.3007

1.501

1.933

77.7 %

4.993

0.3996

1.995

2.544

78.4 %

4.993

0.5

2.497

3.163

78.9 %

4.993

0.6002

2.997

3.812

78.6 %

4.993

0.7006

3.498

4.501

77.7 %

4.993

0.7994

3.991

5.114

78.0 %

4.993

0.8998

4.493

5.664

79.3 %

4.993

1.0001

4.993

6.209

80.4 %

Table 8.

Low load efficiency @ 230 Vrms

Vout [V]

Iout [A]

Pout [W]

Pin [W]

Eff [%]

4.994

0.1

0.499

0.826

60.5 %

4.994

0.2002

1.000

1.471

68.0 %

4.994

0.3006

1.501

2.13

70.5 %

4.994

0.3995

1.995

2.798

71.3 %

4.994

0.4999

2.497

3.486

71.6 %

4.994

0.6001

2.997

4.161

72.0 %

4.994

0.7006

3.499

4.806

72.8 %

4.994

0.7994

3.992

5.304

75.3 %

4.994

0.8997

4.493

5.934

75.7 %

4.994

6.667

74.9 %

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