CONTROL FUNCTIONS - PR PIN
AC coupled single-wire interface. All PR pins are connected
to a single communication bus through 0.001 µF (500 V)
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.
Technical Information
For additional technical information contained in the Design
Guide and Applications Manual for Maxi, Mini, Micro Family
DC-DC Converters and Accessory Modules, click on the link
below:
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.
http://www.vicorpower.com/mmmguide
+IN
+IN
0.001µF
PC
PC
Module 1
Module 1
PR
PR
–IN
–IN
+IN
+IN
0.001µF
PC
PC
Module 2
Module 2
(up to 12)
(up to 12)
PR
PR
–IN
–IN
Ground plane
Ground plane
Figure 10 — AC coupled single-wire interface.
Figure 9 — DC coupled single-wire interface.
+OUT
• The +Out and –Out power buses should be
designed to minimize and balance parasitic
impedance from each module output to the load.
+S
–S
+S
SC
–S
Module 1
Module 2
–OUT
+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.
+S
+OUT
+S
SC
–S
+S
–S
+S
SC
–S
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 –S.
–OUT
–S
–OUT
+Sense from
other modules
in the array
+OUT
• OR’ing diodes may be inserted in series with
the +Out pins of each module to provide
module output fault tolerance.
+S
SC
–S
Module N+1
–OUT
Figure 11 — N+1 module array output connections.
Figure 12 — OR’ing diodes connections.
PIN STYLES*
Designator
Description
Notes
(None)
Short Tin/Lead
Long Tin/Lead
Short ModuMate
Long ModuMate
Short RoHS
Requires inboard, mounting
Onboard mounting for 0.065" boards
SurfMate or inboard socket mounting
Onboard socket mounting
L
S
N
F
Select for RoHS compliant inboard solder, socket, or SurfMate mounting
Select for RoHS compliant onboard solder or socket mounting
G
Long RoHS
*
Pin style designator follows the “B” after the output power and precedes the baseplate designator.
Ex. V28A12T200BN2 — Long ModuMate Pins
Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
28 V Maxi Family
Rev. 1.7
Page 8 of 10
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