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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+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

Load

+S

–S

+S

–S

+S

–S

+OUT

+S

SC

–S

–OUT

+OUT

+S

SC

–S

–OUT

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.

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

capacitors. This interface supports current sharing and is fault

tolerant except for the communication bus. See Figure 10.

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.

+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

Designator

Description

Notes

(None)

Short Tin/Lead

Requires inboard, mounting

L

Long Tin/Lead

Onboard mounting for 0.065" boards

S

Short ModuMate

SurfMate or inboard socket mounting

N

Long ModuMate

Onboard socket mounting

F

Short RoHS

Select for RoHS compliant inboard solder, socket, or SurfMate mounting

G

Long RoHS

Select for RoHS compliant onboard solder or socket mounting

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

Ex. V28A12T200BN2 — Long ModuMate Pins

CONTROL FUNCTIONS - PR PIN

PIN STYLES*