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CUI Inc │ SERIES: VWRBT3 │ DESCRIPTION: DC-DC CONVERTER
date 09/11/2012 │ page 4 of 5
APPLICATION NOTES
-All of the VWRBT3-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).
+Vout
0V
Vin
Cin
DC DC
GND
Figure 1
1.
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, or add external inductor to the circuit as shown above.
General:
Cin: 12V 100μF
24V & 48V 10μF to 47μF
Cout:see Table 2
Vout
5 V
Cout/μF (max)
1000
680
470
330
9 V
Table 1
12 V
15 V
2. 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 mod-
ule. (Figure 2)
Ip
Figure 2
Input Voltage
Range
Input Voltage (V)
3. Output Load
In order to ensure the product operates efficiently and reliably, make sure the specified range of input voltage is not exceeded.
No parallel connection or plug and play.
4. NC Terminals
Unless otherwise specified, NC terminals of all series are used for converter's interior circuit connection, and are not allowed connec-
tion of any external circuit.
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