Northern Airborne Technology VR33-001 - Manual (Page 4)

SM47 Rev. 4.00 VR33 Series DC Power Converter Manual
Section 1 Description
1.1 Introduction
This manual contains information on the VR33 Series DC Power Converters.
Descriptions and information will be given for the VR33-001 and the VR33-002 models.
Any differences between the two models will be noted. 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 General
The VR33 is a power conversion device designed to increase the nominal 28 Vdc
aircraft voltage to 33 Vdc using high speed switching DC-DC conversion.
When used in conjunction with the NAT PA250/PA700 Series or high power PA
amplifiers, the additional available voltage provided by the VR33 significantly increases
the available power to the speakers and thus extends the audible range of the system.
1.3 Features
The VR33-001 is used with the PA250-xxx Audio Power Amplifier, and boosts the
output power from 250 to 400 Watts.
The VR33-002 provides two outputs, which makes it ideal for use with the PA700-xxx
Audio Power Amplifier. It boosts the PA700-xxx output power from 700 to 850 Watts.
1.4 Specifications
1.4.1 Electrical Specifications
Input
Input Power VR33-001 140 Watts
Input Power VR33-001 280 Watts
Input Voltage +28.0 Vdc nominal
+21.0 Vdc minimum
+32.0 Vdc maximum
Input Current VR33-001 5.0 Adc + PA250-xxx current (15-20 Adc full load)
VR33-002 10.0 Adc + PA700-xxx current (35 Adc full load)
Nov 16, 2005 Page 1-1
ENG-FORM: 800-0108.DOT
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