Specifications

1-800-927-9474

20-16

DC MegaPAC Input Voltage Range and Vin OK Limits

Operating Range Vin OK Trigger

Nominal Low High Low Line High Line

Code Vdc Line Line Cut off Cut off

0 12V 10V 20V 6V to 10V 20V to 23V

1 24V 21V 32V 16V to 21V 32V to 36V

W 24V Wide 18V 36V 12V to 18V 36V to 41V

2 36V 21V 56V 11V to 21V 56V to 63V

3 48V 42V 60V 34V to 42V 60V to 68V

N 48V Wide 36V 76V 23V to 36V 76V to 86V

4 72V 55V 100V 40V to 55V 100V to 112V*

*Do not apply greater than 100V to the input of the DC MegaPAC.

ConverterPAC Functional Descriptions

A brief description of the standard output assemblies and the power and interface connections is

provided. Please refer to the MegaPAC Family data sheet for technical specifications and

mechanical details.

ModuPAC

The ModuPAC output assembly consists of a VI-200 DC-DC converter that converts the

unregulated high voltage bus to the desired regulated output voltage. The converter is fused with

a PC-Tron 3A fast-acting fuse in the positive input terminal. The output of the converter

contains a passive LC filter to reduce output ripple/noise down to 1% (typ.), and 2% (max.)

when measured peak to peak up to a 20 MHz bandwidth from 10% to 100% of rated load of the

converter. To meet VXI noise level standards the “V2” option can be selected for outputs up to

15Vdc, and the “V1” option can be selected for 24Vdc outputs. Option “V2” limits output

ripple/noise to 50 mV peak to peak, and option “V1” limits output ripple/noise to 150 mV peak

to peak. An optional DC Power Good signal and/or output voltage adjustment potentiometer

may be specified.

The ModuPAC contains output overvoltage protection (OVP), overcurrent protection (OCP),

and overtemperature protection (OTP). The OCP has automatic recovery when the overcurrent

condition is removed. The OVP and OTP are latching functions, and require recycling of the

AC input power to restart.

JuniorPAC

The JuniorPAC consists of one VI-J00 DC-DC converter that converts the unregulated input

voltage to the desired regulated output voltage. The assembly is fused with a single PC-Tron

fast-acting fuse. The output contains a passive LC filter to reduce output ripple/noise to 1%

(typ.), and 2% (max.) when measured peak to peak up to a 20 MHz bandwidth from 10% to

100% of rated load of the converters. To meet VXI noise level standards the “V2” option can be

selected for outputs up to 15Vdc, and the “V1” option can be selected for 24Vdc outputs.

Option “V2” limits output ripple/noise to 50 mV peak to peak and option “V1” limits output

ripple/noise to 150 mV peak to peak. An optional DC Power Good signal and/or output voltage

adjustment potentiometer may be specified.

Applications Manual

Table 1.