Rev F

JFC SERIES

15 Watts

DC DC Converter

Single and Dual Outputs

1/9/2018

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 9 of 11

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 an external

resistor between the TRIM and –OUTPUT pin, the output voltage set point 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 or rated power.

Trim Up Equation

Trim Down Equation

Trim Constants

Module

G

H

K

L

JFCxxS3.3-xxxx

5110

2050

0.8

2.5

JFCxxS5-xxxx

5110

2050

2.5

2.5

JFCxxS12-xxxx

10000

5110

9.5

2.5

JFCxxS15-xxxx

10000

5110

12.5

2.5

JFCxxS24-xxxx

56000

13000

21.5

2.5

Output Voltage Adjustment Configurations

JFCxxS3.3-xxxx TRIM-UP

Trim-Up (%)

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 (k

Ω)

385.071

191.511

126.990

94.730

75.374

62.470

53.253

46.340

40.963

36.662

TRIM-DOWN

Trim-Down (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

3.267

3.234

3.201

3.168

3.135

3.102

3.069

3.036

3.003

2.970

RD (k

Ω)

116.719

54.779

34.133

23.810

17.616

13.486

10.537

8.325

6.604

5.228

JFCxxS5-xxxx TRIM-UP

Trim-Up (%)

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 (k

Ω)

253.450

125.700

83.117

61.825

49.050

40.533

34.450

29.888

26.339

23.500

TRIM-DOWN

Trim-Down (%)

1

2

3

4

5

6

7

8

9

10

Vout (V)

4.950

4.900

4.850

4.800

4.750

4.700

4.650

4.600

4.550

4.500

RD (k

Ω)

248.340

120.590

78.007

56.715

43.940

35.423

29.340

24.778

21.229

18.390