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CUI Inc │ SERIES: VWRAS2-SIP │ DESCRIPTION: DC-DC CONVERTER date 08/22/2013 │ 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 noted that the
input current (Ic) should between 5-10mA, exceeding the maximum 20mA will cause permanent damage to the converter. The value
of R can be derived as follows :
Recommended Circuit
If you want to further decrease the input/output ripple, an “LC” fi ltering network may be connected to the input and output ends of
the DC/DC converter, see (Figure 1).
However, the capacitance of the output fi lter capacitor must be proper. If the capacitance is too big, a startup problem might arise. To
ensure safe and reliable operation see Table 1 for the maximum capacitance of each channel of output.
2. Input Curent
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 suffi cient starting current Ip.
General: Ip ≤1.4*Iin-max
3. No parallel connection or plug and play
Table 1
APPLICATION NOTES
Input Current(A)
Input Volta
e
V
Input Voltage
Range
Ip
R=
V
C
-V
D
-1.0
I
C
Note: 1. All specifi cations measured at Ta = 25°C, humidity <75%, nominal input voltage and rated output load unless otherwise specifi ed.
Figure 1
+Vo
0V
Cout
6
8
7
Cout
Lout
Lout
-Vo
Cin
Vin
GND
2
1
3
Vc
R
Lin
Ic
D1
Vin
(Vdc)
Cin
(μF)
Lin
(μH)
Cout
(μF)
Lout
(μH)
5 100 4.7~120 100 2.2~10
12 100 4.7~120 100 2.2~10
24 10~22 4.7~120 100 2.2~10
48 10~22 4.7~120 100 2.2~10
Vout
(Vdc)
Cout
(μF)
±5 560
±9 470
±12 330
±15 270
For more information, please visit the product page.