6 680 Series Video Distribution Amplifiers Installation and Operation Manual
Chapter 1: 680 Series Mounting Frames
PS-684 Power Supply
The model 684PS power supply is a two-stage switching power supply that
provides the following outputs:
+13V @ 1.5A
–13V @ 1.5A
Initial design criteria focused on maximizing efficiency and minimizing
individual component temperature rise. This has been achieved with a two-stage
design consisting of an input “Buck” converter feeding a high efficiency
push-pull output stage. Overall efficiency exceeds 80%; individual component
temperature rise is minimized by operating both converters at high voltage and
low current, as well as using Schottky rectifier diodes on the output stage. The
power supply is designed to work over the two standard input voltage ranges.
The power supply’s operating range is switchable between 90–135 VAC and
180–250 VAC. Output voltage is adjustable by ±10%. Other output voltages can
be achieved by changing power transformer TR1 without any additional circuit
changes.
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