Datasheet

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CUI Inc │ SERIES: PQM3-M │ DESCRIPTION: DC-DC CONVERTER date 05/14/2014 │ page 5 of 6
1. Output load requirement
To ensure this module can operate efciently and reliably, the minimum output load may not be less than 5% 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. Recommended circuit
This series has been tested according to the following recommended testing circuit before leaving the factory. This series should be
tested under load (see Figure 3 & Table 3). If you want to further decrease the input/output ripple, you can increase the capacitance
accordingly or choose capacitors with low ESR. 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 4).
3. Input Current
When it is used in an unregulated condition, make sure that the input uctuations and ripple voltage do not exceed the module stan-
dard. Refer to Figure 4 & Table 5 for the startup current of this dc-dc module.
APPLICATION NOTES
Figure 3
Figure 4
Table 3
Vin
(Vdc)
Cin
(µF)
Cout
(µF/mA)
12 100 10/100
24 10~47 10/100
48 10~47 10/100
Note: 1. Minimum load shouldn't be less than 5%, otherwise ripple may increase dramatically. Operation under minimum load will not damage the converter, however, they may
not meet all specications listed.
2. Maximum capacitive load is tested at input voltage range and full load.
3. All specications are measured at Ta=25°C, humidity<75%, nominal input voltage and rated output load unless otherwise specied.
Range
InputVoltage
Input Curre nt(A)
InputVoltage (V)
Ip
Vin
(Vdc)
Ip
(mA)
12 640
24 320
48 160
DC DC
Vin
GND
+Vo
0V
Cin
Cout
Vout
(Vdc)
Max. Capacitive Load
(μF)
5 3300
12 1800
15 1000
Table 4
Table 5
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