DER-19

TOP245P Multiple Output Set Top Box

March 30, 2004

Page 17 of 25

Power Integrations, Inc.

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

9.4.2 Line

Line regulation was measured at full continuous output power. The regulation, expressed

as a percentage on nominal rail voltage, and as a function of line voltage is shown in

Figure 9 below.

-10

-8

-6

-4

-2

0

2

4

6

8

10

180

200

220

240

260

280

Line Voltage (Vrms)

3V3

5V

12V

20V

Figure 9 – Line Regulation, Room Temperature, Full Load.

9.5

Cross Regulation

Figure 10 gives the cross regulation results at 230V input.

3V3 - 5V - 12V - 20V

3V3

5V

12V

20V

XXXX

3.38

5.28

12.70

19.95

XXXM

3.39

5.28

12.67

19.63

XXMX

3.38

5.28

12.63

19.92

XXMM

3.39

5.00

12.62

19.64

XMXX

3.40

5.19

12.94

20.53

XMXM

3.39

5.18

12.79

19.86

XMMX

3.39

5.19

12.77

20.30

XMMM

3.33

5.10

12.55

19.58

MXXX

3.33

5.25

13.19

20.85

MXXM

3.28

5.20

12.87

20.00

MXMX

3.30

5.17

12.92

20.57

MXMM

3.27

5.10

12.72

19.80

MMXX

3.25

5.15

13.00

20.76

MMXM

3.24

5.12

12.80

19.93

MMMX

3.24

5.14

12.83

20.79

MMMM

3.22

5.12

12.69

19.84

Min (V)

3.22

5.00

12.55

19.58

Max (V)

3.40

5.28

13.19

20.85

% Below

-2.42

0.00

4.58

-2.10

% Above

3.03

5.60

9.92

4.25

Min Load (X)

1

1

0.35

0.1

Max Load (M)

3

2

0.5

0.3

Figure 10 - Cross Regulation