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

FasTrak Mini E-Grade Family

Rev. 1.0

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.

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

R1

4

2

7

6

Load

LM10

+Out

SC

–Out

R2

R3

1

3

8

1.05K

Ω

200

Ω

R4

1.2K

Ω

+Out

SC

–Out

+Out

SC

–Out

+Out

SC

–Out

L

O

A

D

Plane

Ground

Plane

• 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.

• Do not use output

OR’ing diodes with

MicroMods.

• 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 12—Voltage drop compensation.

Figure 11—N+1 module array output connections.

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 – RoHS compliant

N

Long ModuMate

On-board socket mounting – RoHS compliant

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

Ex. V375A24C600BN — Long ModuMate Pins