DMC-21x3 Accessories Chapter 2 SR-19900• 9
Chapter 2 SR-19900
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Introduction
For applications requiring a shunt regulator, Galil offers a small mountable model that can be configured for varying
voltage levels. Two fixed voltage threshold settings are available with jumpers, which can be set at either 33 or 66
volts. Additionally, a user defined voltage threshold can be set by changing a simple resistor. This shunt regulator
operates with hysteresis, where the regulator switches on at the set voltage threshold and switches off at 2 volts
below.
The shunt regulator should be placed in parallel with the power supply as in the figure below, and it should be
mounted to a metal surface using thermal grease to aid in heat transfer. Connections are made to the unit at VS
(voltage supply) and PG (power ground) using either the 4-pin Molex connector or the 8-pin Mate ‘N Lock
connector (AMP# 770579-1).
For a summary of shunt regulator operation, as well as details to help determine if one is required in your system,
please refer to application note #5448 at: (
http://www.galilmc.com/support/appnotes/miscellaneous/note5448.pdf).
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