CUI Inc │ SERIES: VWRBT2 │ DESCRIPTION: DC-DC CONVERTER
date 10/14/2011 │ page 4 of 5
APPLICATION NOTES
All of the VWRBT2-SMT Series have been tested according to the following recommended testing circuit before leaving the factory. This
series should be tested under load (Figure 1). If you want to further decrease the input/output ripple, you can increase capacitance
properly or choose capacitors with low ESR. However, the capacitance should not be too high (Table 1).
Single Vout
(Vdc)
Cout
(μF)
+Vin
-Vin
+Vout
-Vout
3.3
5
2,200
1,000
680
Figure 1
Table 1
Cin
DC
DC
9
12
15
470
330
1. Requirement on Output Load
In order to ensure the product operates efficiently and reliably, make sure the specified range of input voltage is not exceeded. The
minimum output load must be at least 10%. If the actual load is less than 10%, the output ripple may increase sharply while the
efficiency and reliability will greatly reduce.
2. Recommended Circuit
It is best to test with full load and not to test without load. To further reduce output ripple, you may increase the external capacitor,
choose a capacitor with low ESR.
3. Input Current
Nominal input voltage range. The input current of the power supply must be sufficient to the startup current (Ip) of the DC/DC
module (Figure 2)
IP≤1.4*Iin-max
Figure 2
4. No parallel connection or plug and play
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