Rev C

MDW SERIES

20 Watts

DC/DC Converter

Single and Dual Output

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 6 of 8

REMOTE ON/OFF CONTROL

The remote ON/OFF pin allows the user to turn the DC/DC power module on during a logic high and off during a logic low. Figure 3 gives several

examples of acceptable configurations. The remote ON/OFF pin is an open collector/drain logic input signal (Von/off) that has -Vin as the reference

voltage. If not using the remote on/off feature, open the circuit between the on/off pin and the -input pin to turn the module on.

REMOTE ON/OFF IMPLEMENTATION

Isolated-Closure Remote ON/OFF

Level Control Using TTL Output

Level Control Using Line Voltage

OUTPUT VOLTAGE ADJUSTMENT

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

accomplished by connecting an external resistor between the TRIM pin and either the +Vout or -Vout pins. With an external resistor

between the TRIM and -Vout pin, the output voltage set point increases. With an external resistor between the TRIM and +Vout pin,

the output voltage set point decreases.

Figure 4

MDWxxS3.3-5500

MDWxxS5-4000

Trim

1%

3.333V

57.930

kΩ

3.267V

69.470

kΩ

2%

3.366V

26.165

kΩ

3.234V

31.235

kΩ

3%

3.399V

15.577

kΩ

3.201V

18.490

kΩ

4%

3.432V

10.283

kΩ

3.168V

12.117

kΩ

5%

3.465V

7.106

kΩ

3.135V

8.294

kΩ

6%

3.498V

4.988

kΩ

3.102V

5.745

kΩ

7%

3.531V

3.476

kΩ

3.069V

3.924

kΩ

8%

3.564V

2.341

kΩ

3.036V

2.559

kΩ

9%

3.597V

1.459

kΩ

3.003V

1.497

kΩ

10%

3.630V

0.753

kΩ

2.970V

0.647

kΩ

Trim

1%

5.050V

36.570

kΩ 4.950V

45.533

kΩ

2%

5.100V

16.580

kΩ 4.900V

20.612

kΩ

3%

5.150V

9.917

kΩ

4.850V

12.306

kΩ

4%

5.200V

6.585

kΩ

4.800V

8.152

kΩ

5%

5.250V

4.586

kΩ

4.750V

5.660

kΩ

6%

5.300V

3.253

kΩ

4.700V

3.999

kΩ

7%

5.350V

2.302

kΩ

4.650V

2.812

kΩ

8%

5.400V

1.588

kΩ

4.600V

1.922

kΩ

9%

5.450V

1.032

kΩ

4.550V

1.230

kΩ

10%

5.500V

0.588

kΩ

4.500V

0.676

kΩ