7/35

AN1376 APPLICATION NOTE

The efficiency of the converter is not very high but it is heavily affected by 5V the linear regu-

lator delivering 1.1 A. Delivering 1.6A on the 7V output but removing the 5V regulator the ef-

ficiency measured is 75.6% @220Vac and 76.9% at 115Vac.

■

Reduced Load - for Cable STB, without the LNB

The above tables shown the output voltage measured applying the same loads that we could

have in case of a different Set-top Box type is powered (e.g. a terrestrial or cable) without the

LNB block of the satellite antenna. Like before all the output voltages are within the toleranc-

es.

Vout [V} =

30.5

7.197

12.19

3.279

4.94

Vin [Vrms]=

220

Iout [A] =

0.015

0.5

0.702

2.073

1.103

Iin [Arms] =

0.31

Pout [W] =

0.458

3.599

8.557

6.797

5.449

Pin [W] =

35.1

37.2

12.04

EFF. = 70.82%

ALL VOLTAGES ARE WITHIN TOLERANCE

Vout [V} =

31.4

7.18

12.11

3.359

4.965

Vin [Vrms]=

115

Iout [A] =

0

0.25

0.3

1.008

0.55

Iin [Arms] =

0.26

Pout [W] =

0.000

1.795

3.633

3.386

2.731

Pin [W] =

16.8

35.5

11.39

EFF. = 68.72%

ALL VOLTAGES ARE WITHIN TOLERANCE

Vout [V} =

31.4

7.16

12.08

3.36

4.975

Vin [Vrms]=

220

Iout [A] =

0

0.25

0.3

1.008

0.55

Iin [Arms] =

0.17

Pout [W] =

0.000

1.790

3.624

3.387

2.736

Pin [W] =

17.6

35.4

11.5

EFF. = 65.55%

ALL VOLTAGES ARE WITHIN TOLERANCE