Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715

V375A3V3C264B DC-DC Converter

Rev. 3

Page 6 of 8

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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.

+Out

+S

SC

–S

–Out

+Sense from

other modules

in the array

Figure 12—OR’ing diodes connections.

Module 2

Module 1

Module N+1

+Out

+S

SC

–S

–Out

+Out

+S

SC

–S

–Out

+Out

+S

SC

–S

–Out

Load

+S

–S

+S

–S

+S

–S

Figure 11—N+1 module array output connections.

• The +Out and –Out power buses should be

designed to minimize and balance parasitic

impedance from each module output to the load.

• 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 9—DC coupled single-wire interface.

+In

PC

PR

–In

Module 2

(up to 12)

+In

PC

PR

–In

Module 1

Ground plane

+In

PC

PR

–In

Module 2

(up to 12)

+In

PC

PR

–In

Module 1

Ground plane

Figure 10—AC coupled single-wire interface.

0.001µF

0.001µF

PIN STYLES *

Designator

Description

Notes

(None)

Short solder

Requires in-board, mounting

L

Long solder

On-board mounting for 0.065" boards

S

Short ModuMate

SurfMate or in-board socket mounting

N

Long ModuMate

On-board socket mounting

* Pin style designator follows the “B” after the output power and precedes the baseplate designator.

Ex. V48B24C250BN — Long ModuMate Pins