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Description, 1 introduction, 2 purpose of equipment – Northern Airborne Technology VR28-013 User Manual

Page 7: 3 features, 4 specifications, 1 electrical specifications

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SM32A Rev 4.00

VR28-013 DC/DC Power Converter Manual

Section 1 Description

1.1

Introduction

This manual contains information on the VR28-013

DC/DC Power Converter (serial

numbers 1221 and later). All derivative products will be covered by manual
supplements, which can be obtained from NAT as required.

Information in this section consists of purpose of equipment, features and specifications.

1.2

Purpose of Equipment

The VR28-013 is an efficient voltage converter designed to power non-aircraft radios or
equipment from a 28 Vdc aircraft power buss. It is a remote bulkhead mounted unit
designed to convert a nominal +28 Vdc input to a nominal +13 Vdc output at up to 6 Amps.

1.3

Features

The VR28-013 uses the same switched-mode power supply (SMPS) circuitry utilized by
NT-series radios to provide constant output power without excessive heat generation.

The unit has remote on/off switching.

An output power LED is provided to give a visual indication that the unit is operating.

Power In, Power Out, and Ground pins are grouped together and internally connected
for installation versatility.

The unit has over-voltage and reverse-voltage protection to ensure operation in severe
aircraft environments.

1.4

Specifications

1.4.1

Electrical Specifications

Power Supply: Switched-mode regulated power supply with input reverse-polarity, over-

current, over-voltage, and output short-circuit protection.

Operating Voltages

Nominal

+28.0 Vdc

Minimum +22.0

Vdc

Maximum +30.3

Vdc

Emergency +18.0

Vdc

Aug 21, 2006

Page 1-1

ENG-FORM: 800-0108.DOT

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.