TN830 Rev 7-0-0 Aug 16
TN830 AC to DC and DC to DC Power Supplies
MT-3/4 Radio Systems
TECHNICAL NOTES
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CODANCOMMS.COMTECHNICAL NOTE:
TN830, REV 7-0-0, © Aug 2016
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The PSA-4P-1 and PSA-4U-1 AC switching power
supplies provide a regulated +13.8 Vdc to the output
terminals. Valuable rack space has been saved by
mounting the “P” version AC power supply inside
the rear panel frame that attaches to the rear of the
subrack. The “U” version is sold unmounted. An AC
power socket is located on the outside of the subrack
rear panel and accepts standard IEC320 type cordsets.
Input Voltage Range 100–265 Vac Universal
Input Frequency Range 50 / 60 Hz
Output Voltage +13.8 Vdc ± 70 mV
Output Current 20 Amps continuous
AC Fuse 4.0 Amps
Effi ciency 90%
Operating Temperature -45°C to +50°C (-50°F to +125°F)
Features:
Float Charger and Battery Backup:
A 12V battery terminal connector, conveniently routed to the back of the auxiliary panel for ease of access,
allows connection of a Lead Acid battery for fl oat charging. During a power failure the Lead-Acid battery
provides backup power to the primary output. This terminal is fused protected from excessive current draw
and reverse polarity connections.
Voltage Adjust:
Output voltage may be adjusted slightly by turning an internal potentiometer. The potentiometer may be
accessed through an opening on the top of the lid.
Active Current Limiting:
In the event of a short circuit condition, the output will shut down in order to protect the power supply from
overheating. Once the load is returned to within specifi cation, the output will be reset automatically.
Overvoltage Protection:
The output is limited to a pre-determined voltage level, in the event of a fault condition.
Input Voltage Surge:
The power supply is protected at the input by a transient voltage suppressor, which will limit any unwanted
voltage surges. There is also an inline fuse present at the input for additional safety.
Output Isolation:
A high power schottky diode at the output prevents any unwanted feedback into the power supply from the
load.
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