advertisement Monitor Network Compliant –48V Power Supplies
Design Note 290
Brendan Whelan
Introduction
Reliability is a top priority for the designers of
modern telephone and communication equipment.
Designers take extra care to protect circuitry from
failure-causing temperature and voltage changes,
employing redundancy whenever possible, especially
for power supplies. The power supplies are monitored
to obtain early warning of impending failure. Often
complicated circuitry that can include a voltage reference, comparators, voltage regulator and several
precision resistor dividers is used. Designers may also
use discrete components to monitor and indicate the
state of power supply fuses. The resulting circuitry
can be expensive in terms of component cost, board
space and engineering time. The LTC В®1921 replaces
the complicated monitoring circuitry with a simple
integrated precision monitoring system contained
entirely in an 8-lead MSOP package.
Features
The LTC1921 is the only integrated solution that can
monitor two independent –48V power supplies, plus …