CONTROL FUNCTIONS - PR PIN
Parallel Operation
The PR pin supports paralleling for increased power with N+1
(N+M) redundancy and phased array capability. Modules of
the same input voltage, output voltage, and power level will
current share if all PR pins are suitably interfaced.
Compatible interface architectures include the following:
DC coupled single-wire interface.
All PR pins are directly
connected to one another. This interface supports current
sharing but is not fault tolerant. Minus In pins must be tied to
the same electric potential. See Figure 9.
AC coupled single-wire interface.
All PR pins are connected to
a single communication bus through 0.001µF (500V)
capacitors. This interface supports current sharing and is fault
tolerant except for the communication bus. See Figure 10.
+In
PC
PR
–In
Module
1
+Out
+S
SC
–S
–Out
+In
+Out
+S
Module
1
0.001µF
PC
PR
–In
SC
–S
–Out
+In
PC
Module 2
(up to 12)
+Out
+S
SC
–S
–Out
+In
+Out
+S
Module 2
(up to 12)
0.001µF
PC
PR
–In
SC
–S
–Out
PR
–In
Ground plane
Ground plane
Figure 9—DC
coupled single-wire interface.
+In
Module
1
PC
PR
–In
+Out
+S
SC
–S
–Out
• The +Out and –Out power buses
should be designed to minimize
and balance parasitic impedance
from each module output to the
load.
+S
+In
PC
PR
–In
+In
Module
N+1
PC
PR
–In
+Out
+S
SC
–S
–Out
• The +Sense pins should be tied
to the same point on the +Out
power bus; the –Sense pins
should be tied to the same point
on the –Out power bus.
• At the discretion of the power
system designer, a subset of all
modules within an array may be
configured as slaves by shorting
SC to –S.
• OR’ing diodes may be inserted in
series with the +Out pins of each
module to provide
module output fault tolerance.
Figure 10—AC
coupled single-wire interface.
+S
–S
+In
PC
PR
–In
+Out
+S
SC
–S
–Out
+Sense from
other modules
in the array
Module
2
+S
Load
–S
–S
+Out
+S
SC
–S
–Out
Figure 11—N+1
module array output connections.
PIN STYLES *
Designator
(None)
L
S
N
Description
Short solder
Long solder
Short ModuMate
Long ModuMate
Notes
Figure 12—OR’ing
diodes connections.
Requires in-board, mounting
On-board mounting for 0.065" boards
SurfMate or in-board socket mounting
On-board socket mounting
* Pin style designator follows the “A” after the output power and precedes the baseplate designator.
Ex. V375A24C600AN — Long ModuMate Pins
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
V375B24C300A DC-DC Converter
Rev. 5.2
Page 6 of 8
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