DER-19

TOP245P Multiple Output Set Top Box

March 30, 2004

Page 15 of 25

Power Integrations, Inc.

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

www.powerint.com

9

Performance Data

All measurements performed at room temperature, 50 Hz input frequency.

9.1

Efficiency

Full power efficiency was measured as a function of line voltage and Figure 6 gives the

resulting profile.

70

72

74

76

78

80

82

84

86

88

90

180

200

220

240

260

280

Figure 6- Full Continuous Power Conversion Efficiency

Efficiency as a function of output power was measured at 230V input, each rail load

increased from zero to 100% load simultaneously in 10% load steps. Figure 7 shows the

resulting efficiency profile.

0

10

20

30

40

50

60

70

80

90

0

5

10

15

20

25

30

35

Output Power (W)

Figure 7 - Efficiency Variation with Load