Vicor DC MegaPAC DC-DC Switcher - Manual (Page 6)

Pg. 6 Vicor 800-735-6200 Mission Power Solutions (760) 631-6846 (phone) or (760) 631-6972 (fax) Rev. 3/04
DC MegaPAC Operator’s Manual
ConverterPAC Functional Description
ConverterPACs are the family of slide-in output assemblies used in MegaPAC power supplies.
ConverterPACs are interchangeable within a MegaPAC so they can be added, moved, or changed
as necessary. They are also interchangeable between different AC input MegaPAC chassis. A
ConverterPAC removed from a Mini MegaPAC could be used in a 3 Phase MegaPAC, for exam-
ple. ConverterPACs can be selected with a variety of options and in voltages from 2 to 95 Vdc.
ModuPAC
The ModuPAC output assembly consists of a VI-200 DC to DC converter that converts the high
voltage bus to the desired regulated output voltage. Each ModuPAC can provide up to 200 watts
of power. Multiple ModuPACs can be paralleled in a driver-booster configuration to provide more
power. ModuPACs are fused with a PC-Tron, DC-rated, fast-acting fuse. A passive LC filter is used
to reduce output ripple/noise down to 1% typical, and 2% maximum peak-to-peak from 10% to
100% of rated load. An optional DC Power Good signal, or output voltage Trim potentiometer can
be specified. The ModuPAC contains overvoltage protection (OVP), overcurrent protection (OCP),
and overtemperature protection (OTP). The OCP has automatic recovery when the overcurrent
condition is removed. The OVP and OTP are latching functions and require recycling of the AC
input power to restart.
DualPAC
This output assembly consists of two VI-J00 DC to DC converters that convert the high voltage
bus to the desired regulated output voltages. Each output on a DualPAC can provide up to 100
watts of power and is fused with a single PC-Tron, DC-rated, fast-acting fuse. A passive LC filter
is used to reduce output ripple/noise down to 1% typical, and 2% maximum peak-to-peak from
10% to 100% of rated load. An optional output voltage Trim potentiometer can be specified. DC
Power Good signal is not available. The DualPAC contains overcurrent protection, which recovers
automatically when the overcurrent condition is removed. Overvoltage and overtemperature
protection are not available.
JuniorPAC
The JuniorPAC consists of one VI-J00 DC to DC converter that converts the high voltage bus to
the desired regulated output voltage. JuniorPACs can provide up to 100 watts of output power and
are fused with a single PC-Tron, DC-rated, fast-acting fuse. A passive LC filter is used to reduce
output ripple/noise down to 1% typical, and 2% maximum peak-to-peak from 10% to 100% of
rated load. An optional DC Power Good signal or output voltage Trim potentiometer can be spec-
ified. The JuniorPAC contains output overcurrent protection, which recovers automatically when
the overcurrent condition is removed. Overvoltage and overtemperature protection are not avail-
able.
RAMPAC
This output assembly consists of a VI-J00 DC to DC converter with a Ripple Attenuator Module
(RAM) and is designed for applications requiring low output ripple/noise. The RAMPAC can
attenuate the ripple/noise down to 10 mV peak-to-peak over a 20 MHz bandwidth from 10% to
100% of rated load of the converter. Each RAMPAC can provide up to 100 watts of output power,
and outputs from 5V to 50V are available. An optional DC Power Good signal or output voltage
Trim potentiometer can be specified. The RAMPAC contains output overcurrent protection, which
recovers automatically when the overcurrent condition is removed. Overvoltage and overtempera-
ture protection are not available.
Configuring and Reconfiguring MegaPACs
ConverterPACs can be easily added, replaced, or moved by sliding the assemblies in or out of a MegaPAC chassis.
Most ConverterPACs are driver ModuPACs and can be inserted into any available slot. For outputs greater than
200 watts, a driver ModuPAC and one or more booster ModuPACs will be used. Arrays of drivers and boosters
Figure 2. ModuPAC
Figure 3. DualPAC
Figure 4. JuniorPAC
Figure 5. RAMPAC