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Low-Leakage Version
If Low Leakage is required, the MegaPAC™ Family of Power Supplies has a model variant (must be
requested). This model enables the user to meet various additional specifications. Presently, the PFC
MegaPAC, Mini MegaPAC and Autoranging MegaPAC are available in Low-Leakage versions. Other
models can be made available. The MegaPAC Family of Power Supplies consist of:
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PFC MegaPAC™
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PFC MegaPAC High Power
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PFC MegaPAC-EL™ (Low Noise)
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Mini MegaPAC
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4kW MegaPAC
The advantage of the Low-Leakage MegaPAC power supply is in multiple power supply systems that
have one AC input. This option will lower the input leakage current for these products to 500mA or
less. An additional external EMI filter may be required.
How Low Leakage is Obtained
Low Leakage for the MegaPAC Family of power supplies is obtained with the removal of the "Y"
capacitors from within the EMI filter of the MegaPAC as well as the "Y" capacitors on the input of
the ConverterPACs*. This reduces the leakage current from the AC input to AC ground (chassis) to
below 500mA. At the same time, since the "Y" capacitors are a vital component of the EMI filter,
without them, the EMI will go up. When this happens, the unit will no longer meet the Vicor published
specifications for conducted EMI. In order to reduce the EMI to within an acceptable limit, an additional
external EMI filter may be required. All safety agency certifications for the MegaPAC Power Supplies
remain intact. Contact Applications Engineering for more information.
Vicor currently has the following ConverterPACs (See ConverterPAC™ information sheet and/
or Design Guide for more information):
VI-200™ / VI-J00™
Maxi
ModuPAC™ (M)
FinPAC™ (PZ)
JuniorPAC™ (J)
UniPAC™ (XU)
DualPAC™ (D)
QPAC™ (XQ)
RamPAC™ (R)
375V UniPAC (XT)
BatPAC™ (B)
QPAC™ (L)
DualQPAC™ (LD)
Junior QPAC™ (LJ)
For RoHS-compliant versions a preceeding G is added to the part number.
Please note:
The MegaPACs (including the Low Leakage versions) are not UL 2601/60601 compliant or
EN60601 compliant.
