DC/DC Converter

MED-2

REV.: 06/2016

www.recom-power.com

BASIC CHARACTERISTICS

Parameter

Condition

Min.

Typ.

Max.

Absolute Maximum Input Voltage

( 3sec max.)

2:1

5Vin nom.

12Vin nom.

24Vin nom.

48Vin nom.

16VDC

25VDC

50VDC

100VDC

4:1

24Vin nom.

48Vin nom.

50VDC

100VDC

Under Voltage Lockout

2:1

5Vin nom.

12Vin nom.

24Vin nom.

48Vin nom.

4VDC

8VDC

16VDC

33VDC

4.5VDC

9VDC

18VDC

36VDC

4:1

24Vin nom.

48Vin nom.

8VDC

16VDC

9VDC

18VDC

Start-up Time

constant resistive load, Power up or Remote ON/OFF

30ms

Remote ON/OFF

(referenced to -Vin Pin)

DC-DC ON

DC-DC OFF

Open or 0-1.2VDC

2.2-12VDC

Current of CTRL Pin

-0.5mA

1mA

Remote OFF Input Current

2.5mA

Internal Operating Frequency

135kHz

150kHz

165kHz

Output Ripple and Noise

(20MHz BW limited)

10µF/25V X7R MLCC for 3.3, 5Vout

10µF/25V X7R MLCC for 12, 15Vout

4.7µF/50V X7R MLCC for 24Vout

30mVp-p

40mVp-p

50mVp-p

Calculation Example:

Vin = 12V

Iout = 50%

Eff

Eff

R

T

T

AMBmax

=

T

105 - 4.5 =

100.5°C

T

OVER

=

R

=

18 * 0.25 =

4.5°C

P

DIS50%

=

P

in50%

- P

out50%

=

P

- (P

= 1.75 - 1.5

= 0.25W

Eff

50%

Eff

50%

=

Eff

= 87.5 * 0.98

=

85.75%

Graph1: Efficiency Factor vs. Load

Load [%]

10

0

20

30

40

50

60

70

80

90 100

0.0

0.2

0.4

0.6

0.8

1.2

1.0

Efficiency Crosstable [%] @ full load

Input Voltage

5

12

24

48

24W

48W

3.3S

81

82

82

81

82

81

05S

84.5

84.5

84.5

84

84.5

84

12S

85.5

87

87

87

87

87

15S

87.5

87

87

86.5

87

86.5

24S

85.5

87

87

86.5

87

86.5

05D

83

83.5

83

83

83

83

12D

86

87.5

86

86

87

86

15D

86

86.5

86

86

86

86

Table1: Efficiency Crosstable

Efficiency

REM3

Series

10 20 30

40

50

60 70

80

90 100

Load [%]

50

60

70

80

90

100

choose your model:

REM3-1212D

• Efficiency from Table1 (= 87.5% @ max Load / nom Vin)

• Loading conditions in application (e.g. 50%)

• use Eff factor from Graph1 (= 0.98 @50%)

Calculation: