Vicor 4kW MegaPAC-EL AC-DC Switchers - Manual (Page 6)

UG:108 vicorpower.com Applications Engineering: 800 927.9474 Page 6
ConverterPAC Functional Description
(See ConverterPAC Datasheet/Design Guide for
complete information on all ConverterPACs.)
ConverterPACs are the family of slide-in output assemblies used in MegaPAC power
supplies. Most ConverterPACs of the same length are interchangeable within a MegaPAC
or between different AC input MegaPAC chassis. They can be added, moved, or
changed as necessary. A key feature of the Extended Length ConverterPAC is the low
ripple and noise output to 10mV p-p or 0.15%, whichever is greater. The following
ConverterPACs can be used in the 3 Phase MegaPAC - EL and 4kW MegaPAC - EL.
QPAC (L or XQ)
The QPAC (L) and QPAC (XQ) output assemblies consist of a VI-200/VI-J00 and a Maxi
Vicor DC to DC converters respectively. They convert the unregulated high voltage bus
to the desired regulated output voltage. Each QPAC (L) can provide up to 200 Watts of
output power, and booster QPACs can be added in parallel for more power. Each QPAC
(XQ) can provide up to 500 Watts of output power and slave QPACs can be added in
parallel for more power. The QPAC (XQ) can only be used in the 4kW MegaPAC-EL (Low
Noise). An active preload ensures the DC to DC converter operates in its highest noise
performance range. As the load on the module increases, the preload removes itself
from the circuit. Ripple and common mode noise filters on the output reduce ripple
under any load condition to 10 mV p-p or 0.15%, whichever is greater. QPACs can only
be ordered in the extended length Low Noise MegaPAC products. Please note that for
all QPACs, the output voltage from either output terminal to chassis should not
exceed 400 Volts DC, or peak.
DualQPAC (LD)
The DualQPAC output assembly consists of two VI-J00 Vicor DC to DC converters that
provides two isolated output voltages. DualQPACs can provide up to 100 Watts of output
power from each output. An active preload ensures the DC to DC converters operate in
their highest noise performance range. As the load on the module increases, the preload
removes itself from the circuit. Ripple and common mode noise filters on the output
reduce ripple under any load condition to 10 mV p-p or 0.15%, whichever is greater.
DualQPACs can only be ordered in the extended length Low Noise MegaPAC products.
Please note that for all DualQPACs, the output voltage from either output terminal
to chassis should not exceed 400 Volts DC, or peak.
Junior QPAC (LJ)
The Junior QPAC output assembly consists of one VI-J00 Vicor DC to DC converters
that provide one isolated output voltages. The Junior QPAC can provide up to 100 Watts
of output power from each output and can only be ordered in the extended length Low
Noise MegaPAC products. Please note that for all Junior QPACs, the output voltage
from either output terminal to chassis should not exceed 400 Volts DC, or peak.
+
_ VI-200
QPAC (L)
QPAC (XL)
DualQPAC
Junior QPAC
VI-J00 VI-J00
VI-J00
End of Life - Not Recommended for New Designs