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REV.: 0/2020

L-3

DC/DC Converter

RCDE-48

Series

DROPOUT VOLTAGE

REGULATIONS

Parameter

Condition

Value

Output Current Accuracy

±7.0% max.

Output Current Stability

±2.0% typ.

Deviation vs. Load

RCDE-48-0.35

7

3.5

0

-3.5

5.25

1.75

-1.75

-5.25

-7

0 1 2 3 4 5 6

8

10

7

9

12

11

15

13 14

Output Load [Number of Diodes]

Efficiency vs. Load

Dropout Voltage vs. Load

Output Load [Number of Diodes]

3.0

2.0

1.0

2.5

1.5

0.5

0

2

3

4

5

7

8

10

12

15

6

9

11

13 14

0 1 2 3 4 5

7 8

10

12

15

6

9

11

13 14

Output Load [Number of Diodes]

100

80

60

40

90

70

50

30

20

10

0

RCDE-48-1.05

Dropout voltage is the smallest difference between a regulators input and its

output voltage, which is required to maintain regulation and enable the regulator

to provide rated output voltage or current.

LED+

+V

in

LED-

-V

in

V

in

V

out

V

dropout

RCDE-48-xx

V

V

V

n

V

V

Example:

V

in

= input voltage

V

out

= output voltage

V

dropout

= dropout voltage

n

LED

= number of LEDs

V

F max.

= forward voltage

V

dropout

= 3VDC max.

n

LED

= 11 LEDs

V

F max.

= 3VDC