Bel Fuse Inc.

206 Van Vorst Street, Jersey City, NJ 07302

• Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com

ISOLATED DC/DC CONVERTERS

48 V Input

1.2 V - 2.5 V/80 A, 3.3 V/70 A, 5 V/48 A, 12 V/20 A Output

Output Trim Equations

Equations for calculating the trim resistor (in kΩ) are shown below. The Trim Down resistor should be connected

between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin and the

Vout. Only one of the resistors should be used for any given application.

1.5 V-12 V:

1.2 V:

Notes:

Vo_req=Desired(trimmed) output voltage[V]

Output voltage Vo=3.308 V for 3.3 V output; Vo=5.000 V for 5.0 V; Vo=12.000 V for 12 V output

Efficiency Data

Efficiency Curve

79%

82%

85%

88%

91%

94%

3

5

8

10

13

15

18

20

Output Current (A)

36 V

48 V

75 V

Efficiency Curve

76%

79%

82%

85%

88%

91%

94%

5

1015 20 2530 35 4045 48

Output Current (A)

36 V

48 V

75 V

0RHB-D0T12x

0RHB-D0T05x

Efficiency Curve

76%

79%

82%

85%

88%

91%

94%

10

20

30

40

50

60

70

Output Current (A)

36 V

48 V

75 V

Efficiency Curve

73%

76%

79%

82%

85%

88%

91%

94%

10

20

30

40

50

60

70

80

Output Current (A)

36 V

48 V

75 V

0RHB-D0T03x

0RHB-D0T02x

2

225

.

1

5

.

122

)

100

(

−

⋅

−

⋅

+

=

delta

Vo

delta

Rtrimup

2

100 −

=

delta

Rtrimdown

()

[]

%

100

_

×

−

=

Vo

Vo

req

Vo

delta

Module

Vout

Trim

GND

Rtrimdown

Module

Vout

Trim

GND

Rtrimup

2

6125

.

0

25

.

61

)

100

(

−

⋅

−

⋅

+

=

delta

Vo

delta

Rtrimup