AN2432

Electrical performance

12/27

Another important measurement is the efficiency improvement given by the synchronous

rectification with respect to a standard (diode rectification) flyback. The test was performed

using a STPS8H100 Schottky diode instead of the SR MOSFET. The results are shown in

Table 8. In a load range from 20% to 100% of the rated load, the average efficiency rise is

Table 6.

Mandatory energy saving requirements (from 1 January 2008)

Energy

program

Pin no load

Measure

Efficiency

Measure

Compliant

California

Energy

Commission

(CEC)

< 0.5 W

0.178 W

> 85%

Yes

Australian

< 0.5 W

> 85%

Yes

China

< 0.75 W

> 82%

86.44%

Yes

Table 7.

Voluntary energy saving requirements (from 1 January 2008)

Energy

program

Pin no load

Measure

Efficiency

Measure

Compliant

Energy Star

< 0.5 W

0.178 W

> 84%

1.

Efficiency measured at 25%, 50%, 75% and 100% of rated load and then averaged

Yes

COC (Code Of

Conduct)

European

Union

< 0.3 W

> 84%

86.44%

Yes

China

< 0.75 W

> 85%

86.44%

Yes

Table 8.

Comparison between standard and SR flyback

Value

Load [A]

Var

Var

1

86.54%

83.30%

+3.24%

85.66%

82.26%

+3.40%

2

87.73%

83.98%

+3.75%

86.74%

83.62%

+3.12%

3

88.28%

84.05%

+4.23%

88.97%

84.80%

+4.17%

4

86.95%

83.65%

+3.30%

88.63%

84.98%

+3.65%

5

86.44%

83.34%

+3.10%

89.38%

84.97%

+4.41%

+3.52%

+3.75%