Rev C

JFCW30 SERIES

30 Watt

DC/DC Power Converter

Single and Dual Output

02/27/2017

Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 •

Fax 603-778-9797

website: www.wallindustries.com • e-mail: sales@wallindustries.com

Page 7 of 9

OUTPUT VOLTAGE ADJUSTMENT

Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of the module. This is

accomplished by connecting an external resistor between the Trim pin and either the +Output or –Output pins.

With external resistor between the Trim and –Output pin, the output voltage set increases.

With an external resistor between the Trim and +Output pin, the output voltage set point decreases.

The external Trim resistor needs to be at least 1/16W of rated power.

Trim Up Equation

Trim Constants

Module

G

H

K

L

JFCWxxS33-30

5110

2050

0.8

2.5

JFCWxxS05-30

5110

2050

2.5

2.5

JFCWxxS12-30

10000

5110

9.5

2.5

JFCWxxS15-30

10000

5110

12.5

2.5

JFCWxxS24-30

56000

13000

21.5

2.5

Trim Down Equation

External Output Trimming

Output can be externally trimmed using the method shown below

Trim Up

3.3VDC Single Output Models

ΔV (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

3.333

3.366

3.399

3.432

3.465

3.498

3.531

3.564

3.597

3.630

RU (kΩ)

385.071

191.511

126.990

94.730

75.374

62.470

53.253

46.340

40.963

36.662

5VDC Single Output Models

ΔV (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

5.050

5.100

5.150

5.200

5.250

5.300

5.350

5.400

5.450

5.500

RU (kΩ)

253.450

125.700

83.117

61.825

49.050

40.533

34.450

29.888

26.339

23.500

12VDC Single Outputs Models

ΔV (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

12.120

12.240

12.360

12.480

12.600

12.720

12.840

12.960

13.080

13.200

RU (kΩ)

203.223

99.057

64.334

46.973

36.557

29.612

24.652

20.932

18.038

15.723

15VDC Single Output Models

ΔV (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

15.150

15.300

15.450

15.600

15.750

15.900

16.050

16.200

16.350

16.500

RU (kΩ)

161.557

78.223

50.446

36.557

28.223

22.668

18.700

15.723

13.409

11.557

ΔV (%)

11

12

13

14

15

19

17

18

19

20

Vout (V)

16.650

16.800

16.950

17.100

17.250

17.400

17.550

17.700

17.850

18.00

RU (kΩ)

10.042

8.779

7.711

6.795

6.001

5.307

4.694

4.149

3.662

3.223

24VDC Single Output Models

ΔV (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

24.240

24.480

24.720

24.960

25.200

25.440

25.680

25.920

26.160

26.400

RU (kΩ)

570.333

278.667

181.444

132.833

103.667

84.222

70.333

59.917

51.815

45.333

ΔV (%)

11

12

13

14

15

19

17

18

19

20

Vout (V)

26.640

26.880

27.120

27.360

27.600

27.840

28.080

28.320

28.560

28.800

RU (kΩ)

40.030

35.611

31.872

28.667

25.889

23.458

21.314

19.407

17.702

16.167