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CUI Inc

│ SERIES: VWRBS2 │ DESCRIPTION: DC-DC CONVERTER

date

09/10/2012 │ page 4 of 5

1.

CTRL Terminal

When open or high impedance,the converter work well; When this pin is ‘high’; the converter shutdown; It should be note that the

input current (Ic) should between 5-10mA, exceeding the maximum 20mA will cause permanence damage to the converter. The value

of R Can be derived as follows :

2.

Recommended Circuit

If you want to further decrease the input/output ripple, an “LC” filtering network may be connected to the input and output ends of

the DC/DC converter, see (Figure 1).

However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big, a startup problem might arise.

For every channel of output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor sees

(Table 1).

3.

Input

Current

While using unstable power source, please ensure the output voltage and ripple voltage do not excced indexes of the converter. The

preceding power source must be able to provide for converter sufficient starting current Ipy.

General: Ip ≤1.4*Iin-max

4.

No parallel connection or plug and play

+V o

0V

Co ut

6

7

8

Cs

Cin

Vi n

GND

2

1

3

Vc

R

Li n

Ic

D1

Vin

(Vdc)

Cout

(μF)

3.3

2,200

5

1,000

9

820

12

680

15

560

24

470

Table 1

APPLICATION NOTES

Input Voltage (V)

Inp ut Voltage

Ra nge

Ip

R=

V

I

C

Figure 1

Cin

5, 12 V

24, 48 V

100 μF

10 ~ 22 μF

Lin

--

4.7 ~ 120 μH

Cout

--

100 μF (typ)

Lout

--

2.2 ~ 10 μH

Cs

--

10 ~ 22 μF