Datasheet

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CUI Inc │ SERIES: VAT2-SMT │ DESCRIPTION: DC-DC CONVERTER date 03/30/2015 │ page 4 of 5
1. Output load requirement
Toensurethismodulecanoperateefcientlyandreliably,theminimumoutputloadmaynotbelessthan10%ofthefullloadduring
operation. If the actual output power is low, connect a resistor at the output end in parallel to increase the load.
2. Overload Protection
Under normal operating conditions, the output circuit of this product has no protection against overload. The simplest method to add
this is to add a circuit breaker to the circuit.
3. Recommended circuit
If you want to further decrease the input/output ripple, you can increase the capacitance accordingly or choose capacitors with low
ESR(seeFigure2&Table2).However,thecapacitanceoftheoutputltercapacitormustbeappropriate.Ifthecapacitanceistoo
high,astartupproblemmightarise.Foreverychanneloftheoutput,toensuresafeandreliableoperation,themaximumcapacitance
must be less than the maximum capacitive load (see Table 3).
4. Output Voltage Regulation and Over-voltage Protection Circuit
Thedeviceforoutputvoltageregulation,over-voltageandover-currentprotectionisalinearregulatorandacapacitorlteringnet-
workwithoverheatprotectionwhichcanbeconnectedtotheinputoroutputendinseries(seeFigure3).Therecommendedcapaci-
tanceofitsltercapacitor(seeTable3),andthelinearregulatorisbasedontheactualvoltageandcurrentrequired.
APPLICATION NOTES
Note: 1.Operationunderminimumloadwillnotdamagetheconverter;however,theymaynotmeetallspecicationslisted.
2. Max. capacitive load tested at input voltage range and full load.
3. It is recommended to use either ceramic capacitors or electrolytic capacitors on the input and the output. Using tantalum capacitors may increase the risk of failure.
 4.Allspecicationsmeasuredat:Ta=25°C,humidity<75%,nominalinputvoltageandratedoutputload,unlessotherwisespecied.
Figure 2
Figure 3
Vin
GND
+Vo
0V
DC
Cin
DC
Cout
Cout
-Vo
Vin
GND
0V
+Vo
DC
DC
-Vo
REG
REG
REG
Vin
(Vdc)
Cin
(µF)
Dual Vo
(Vdc)
Cout
(µF)
5 4.7 ±5 4.7
12 2.2 ±9 2.2
- - ±12 1
- - ±15 0.47
Dual Vout
(Vdc)
Max. Capacitive Load
1
(μF)
5 100
9 100
12 100
15 100
Table 2
Note: It’s not recommended to connect any external capacitors in
applications with less than 0.5 watt output.
Table 3
Note: 1.Foreachoutput.
Vin
GND
+Vo
0V
DC
Cin
DC
Cout
Cout
-Vo
Vin
GND
0V
+Vo
DC
DC
-Vo
REG
REG
REG
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