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CUI Inc │ SERIES: VAWQ12 │ DESCRIPTION: DC-DC CONVERTER date 09/19/2013 │ page 4 of 5
1. Recommended Circuit
All of the VAWQ12 models have been tested according to the following recommended testing circuit before leaving factory. If you want
to further decrease the input ripple, Cin is recommended to use 100 μF. If ripple and noise are required, you can increase capacitance
of Cout properly. However, the capacitance should not be higher than Max capacitance. (see Figure 1).
2. Recommended Capacitance
DC DC
Vin
GND
Vout
0V
Cin
Table 1
APPLICATION NOTES
Figure 1
Vout
(Vdc)
Cin
(μF)
Cout
(μF)
3.3/5 100 220
12/15 100 100
0
10
20
30
40
50
60
70
80
90
0 1,000 2,000 3,000 4,000
Load (mA)
50
55
60
65
70
75
80
85
90
9 121518212427303336
Input Voltage (V)
Efficiency (%)
Efficiency (%)
EFFICIENCY CURVES
1. effi ciency vs. load
VAWQ12-Q24-S3R3
2. effi ciency vs. input voltage
VAWQ12-Q24-S3R3
Note: 1. All specifi cations measured at Ta: 25°C, humidity <75%, nominal input voltage and rated output load unless otherwise specifi ed
2. When product begins to work, the temperature may rise slowly until the unit is stabilized. It is normal that the output voltage, derating, and effi ciency may reduce during
this time.
3. Min. load shouldn't be less than 10%, otherwise ripple maybe increased dramatically. If the product operates under min. load may not meet all specifi cations listed.
Operation under minimum load will not damage the converter.
For more information, please visit the product page.
