Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 238 / 510

7-4
Power Supply Coral IPx Office Installation Manual
PS
Office AC Power S
upply Unit
7
0
The PS Office AC includes an AC to DC converter to produce -48V and a DC to DC
converter to produce the +5VDC and +3.3VDC operating voltages for the Coral
IPx Office internal circuitry. All outputs are regulated. Two internal fuses protect the
PS Office AC circuitry from current overload.
Figure 7-4 displays a block diagram of
the PS Office AC power supply.
DC Output Power
The PS Office AC includes one AC-DC converter and one switch-mode DC-DC
converter that converts 100-240VAC/47-63Hz input power to:
„
+5VDC
„
+3.3VDC
„
-48VDC
Normal Operation
The AC input passes through the AC input fuse (FS1) via an RFI filter, into the AC to
DC converter circuit. The converter circuit produces an output of -48VDC. The
-48VDC is fed, via the intermodule fuse (F2), into the DC/DC converter. This circuit
pr5VDC and +3.3VDC.
Figure 7-4 PS Office
AC Block Diagram
...................................................................................................
2 Circuit Description
AC Input fuse
5A/250V S.B.
DC Input fuse
5A/250V S.B.
-48VDC
DC
100-240VAC
47-63Hz
L
E
FS1
F2
On/off
switch
N
AC
GND
+3.3VDC
+5VDC
DC
DC
LED Indicator
(on circuit board)