PD-4

REV.: 0/2016

www.recom-power.com

DC/DC Converter

RP20-FR

Series

External Output Trimming

TRIM UP

TRIM DOWN

Output Voltage Trimming

Single output Powerline converters offer the feature of trimming the output voltage over a certain range around the nominal value by using

external trim resistors. No general equation can be given for calculating the trim resistors, but the following trimtables give typical values for

chosing these trimming resistors. If voltages between the given trim points are required, extrapolate between the two nearest given values to

work out the resis tor required or use a variable resistor to set the output voltage.

Output can be externally trimmed by using the method shown below.

Trim up

1

2

3

4

5

6

7

8

9

10

%

Vout =

3.333

3.366

3.399

3.432

3.465

3.498

3.531

3.564

3.597

3.63

Volts

R

385.07

191.51

126.99

94.73

75.37

62.47

53.25

46.34

40.96

36.66

KOhms

Trim down

1

2

3

4

5

6

7

8

9

10

%

Vout =

3.267

3.234

3.201

3.168

3.135

3.102

3.069

3.036

3.003

2.97

Volts

R

116.72

54.78

34.13

23.81

17.62

13.49

10.54

8.33

6.60

5.23

KOhms

RP20-xx3.3SFR

Trim up

1

2

3

4

5

6

7

8

9

10

%

Vout =

5.05

5.10

5.15

5.20

5.25

5.30

5.35

5.4

5.45

5.50

Volts

R

253.45

125.70

83.18

61.83

49.05

40.53

34.45

29.89

26.34

23.50

KOhms

Trim down

1

2

3

4

5

6

7

8

9

10

%

Vout =

4.95

4.90

4.85

4.80

4.75

4.70

4.65

4.60

4.55

4.50

Volts

R

248.34

120.59

78.01

56.72

43.94

35.42

29.34

24.78

21.23

18.39

KOhms

Trim up

1

2

3

4

5

6

7

8

9

10

%

Vout =

12.12

12.24

12.36

12.48

12.60

12.72

12.84

12.96

13.08

13.20

Volts

R

203.22

99.06

64.33

46.97

36.56

29.61

24.65

20.93

18.04

15.72

KOhms

Trim down

1

2

3

4

5

6

7

8

9

10

%

Vout =

11.88

11.76

11.64

11.52

11.40

11.28

11.16

11.04

10.92

10.8

Volts

R

776.56

380.72

248.78

182.81

143.22

116.83

97.99

83.84

72.85

64.06

KOhms

Trim up

1

2

3

4

5

6

7

8

9

10

%

Vout =

15.15

15.3

15.45

15.60

15.75

15.90

16.05

16.20

16.35

16.50

Volts

R

161.56

78.22

50.45

36.56

28.22

22.67

18.70

15.72

13.41

11.56

KOhms

Trim down

1

2

3

4

5

6

7

8

9

10

%

Vout =

14.85

14.70

14.55

14.40

14.25

14.10

13.95

13.80

13.65

13.50

Volts

R

515.22

401.56

262.67

193.22

151.56

123.78

103.94

89.06

77.48

68.22

KOhms

RP20-xx05SFR

RP20-xx12SFR

RP20-xx15SFR

5

4

4

3