CONTROL FUNCTIONS - PR PIN
Compatible interface architectures include the following:
DC coupled single-wire interface.
All PR pins are directly con-
nected 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 .001µF (500V) capacitors.
This interface supports current sharing and is fault tolerant
except for the communication bus. See Figure 10.
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.
+In
PC
PR
–In
+Out
+In
+Out
Module 1
SC
.001µF
PC
PR
Module 1
SC
–Out
–In
–Out
+In
PC
PR
–In
+Out
+In
+Out
Module 2
(up to 12)
SC
.001µF
PC
PR
Module 2
(up to 12)
SC
–Out
–In
–Out
Ground plane
Ground plane
Figure 9—DC
coupled single-wire interface.
Figure 10—AC
coupled single-wire interface.
+Out
SC
–Out
Plane
+Out
SC
–Out
L
O
A
D
• The +Out and –Out
power buses should be
designed to minimize
and balance parasitic
impedance from each
module output to the
load.
• 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 –Out.
+Out
Volt Drop
Compensator
V+ 7
R3
3
1
8
2
R2
• OR’ing diodes may be inserted
in series with the +Out pin of
each module to provide output
fault tolerance. As an example,
the circuit shown may be used
to compensate for the voltage
drop of the diode.
R1
Load
SC
6
LM10
V- 4
C1
+Out
SC
–Out
Ground
Plane
–Out
• This module is designed for point
of load regulation, where remote
sensing is not required. Active
voltage drop
compensator, as shown here,
may be used in applications with
significant distribution
losses. Details of this circuit are
available in the design guide.
Figure 11—N+1
module array output connections.
Figure 12—OR’ing
diodes connections and voltage drop compensation.
Vicor Corporation
Tel: 800-735-6200 Fax: 978-475-6715
Data Sheet: V24C28C100A DC-DC Converter Date: 11-00 Rev. 2
Page 6 of 8
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