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

72V Micro Family

Rev. 1.8

Page 8 of 11

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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. Negative In pins must be tied

to the same electric potential. Up to three converters may be

paralleled by this method. See Figure 9.

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. Up to three

converters may be paralleled by this method. See Figure 10.

Transformer coupled interface. For paralleling four or more

converters a transformer coupled interface is required. For

details on this configuration please refer to the design guide

referenced in the following technical information section.

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:

http://www.vicorpower.com/mmmguide

Figure 9 — DC coupled single-wire interface.

Module 2

(up to 12)

Module 1

Ground plane

+Out

SC

–Out

+In

PC

PR

–In

+Out

SC

–Out

+In

PC

PR

–In

Module 2

(up to 12)

Module 1

Ground plane

+Out

SC

–Out

+In

PC

PR

–In

+Out

SC

–Out

+In

PC

PR

–In

Figure 10 — AC coupled single-wire interface.

0.001μF

0.001μF