Vicor Autoranging MegaPAC AC-DC Switcher - Manual (Page 23)

UG:106 vicorpower.com Applications Engineering: 800 927.9474 Page 23
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:
n PFC MegaPAC
n PFC MegaPAC-High Power
n PFC MegaPAC-EL (Low Noise)
n Mini MegaPAC
n Autoranging MegaPAC
n 4 kW MegaPAC
n 4 kW MegaPAC-EL (Low Noise)
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 500 mA or less. An additional external EMI filter is typically 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 500 mA. 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 Westcor’s published specifications for
conducted EMI. In order to reduce the EMI to within an acceptable limit, an additional
external EMI filter is required. All safety agency certifications for the MegaPAC Power
Supplies remain intact. Contact Applications Engineering for more information.
Westcor currently has the following ConverterPACs (See ConverterPAC information
sheet and/or Design Guide for more information):
VI-200/VI-J00 Maxi FlexPAC
ModuPAC (M) FinPAC (PZ) FlexPAC (FSS)
JuniorPAC (J) UniPAC (XU)
DualPAC (D) QPAC (XQ)
RamPAC (R)
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.
End of Life - Not Recommended for New Designs