RDF25 Series

www.xppower.com

20 March 19

DC-DC Converter

Application Notes

Remote On/Off - Single Output

-Vout 5

+Vout 4

2 -Vin

3 Ctrl

1 +Vin

Load

EMC

Trim Tables

Derating Curve

-Vout 5

+Vout 4

2 -Vin

1 +Vin

Load

C1

+

L1

25%

-40

-20

020

40

60

80

100 120

50 55

50%

75%

100%

Ambient Temperature (ºC)

With heat-sink

Without heat-sink

Output Voltage Trim

-Vout 5

+Vout 4

Trim 6

Trim down

Trim up

Rd

Ru

Positive logic. Module turns on with logic high. Logic low turns module off. On/Off

is enabled by an external switch between the control pin 3 and -Vin pin 2, e.g.

open collector or drain. If the Remote On/Off is not used leave pin 3 floating.

C1

L1

2.2 µF, 100 V

4.7 µH

Trim Down %

5 V

12 V

15 V

24 V

Rd (k

Ω)

1

248.700

323.351

174.366

881.316

2

110.625

138.100

91.104

466.830

3

66.263

79.928

56.589

293.177

4

44.381

51.470

37.706

197.709

5

31.346

34.591

25.796

137.326

6

22.695

23.418

17.598

95.690

7

16.534

15.477

11.611

65.243

8

11.924

9.542

7.047

42.009

9

8.345

4.939

3.453

23.696

10

5.485

1.264

0.548

8.891

Trim Up%

5 V

12 V

15 V

24 V

Ru (k

Ω)

1

227.338

367.425

661.510

2846.648

2

109.310

179.645

231.250

955.230

3

68.596

113.623

134.015

542.693

4

47.972

79.929

91.042

362.055

5

35.510

59.489

66.818

260.681

6

27.166

45.767

51.270

195.786

7

21.187

35.919

40.445

150.682

8

16.694

28.508

32.475

117.514

9

13.193

22.728

26.362

92.097

10

10.389

18.094

21.524

71.999

Not applicable for 24 V models

(Electrolytic)