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MSF
5000
Instruction Manual
Chapter
1
Description
SSCB
Functional Description
SSCB
Functional Description
DC-DC Converter
-The
DC-DC
converter provides reference voltages for the
SSCB
and other circuits
of
the
Control
Tray.
The
DC-DC
converter also provides various self and system
protection circuits. Figure
1-4
shows
a
block diagram of
the
DC-DC
converter.
TPS
P6
®
+9.6
VDC
I
+9.6
VDC
+5
VDC
A++
(18.8
VDC)
A++
(13.8
VDC)
DC-DC
CONVERTER
Art
(13.8
VDC)
CIRCUITRY
RESET_SWITCH
VA
(4+4VDC),
VB
(44.8
VDC),
VC
(+4.4
VDC), VD
(+3.8
VDC)
LOW VOLTAGE/POWER UP
RESET
TTAC, SECURE
EXP
BUS
SSCB, RF TRAY
TTRC, SECURE
ExP
BUS
MSFI087
021894JNM
Figure
1-4
DC-DC
Converter
Block
Diagram
Reference Voltages
The station Power Supply
generates an unfiltered
Aux
+13.8
Vdc (A++)
routed to
the
SSCB,
TTRC,
and Expansion Tray. It is then filtered
within
the
SSCB
to +13.8
Vdc (A+).
The voltage regulator in
the
RF
Tray
generates +9.6
Vdc
also routed to
'
the
SSCB.
The
DC-DC
converter
circuitry
generates
and/or
routes:
0
+9.6
Vdc
(measured at
TP5)
to the
TTRC, EXP
Bus, and Secure board
+5.0
Vdc
(measured at
TP6)
to the
SSCB
and
RF
Tray
+13.8
Vdc (A++)
to the
TTRC, EXP
Bus, and Secure board
+4.6
Vdc (VA),
+4.4
Vde
(VC),
+3.8
Vdc (VD)
reference
voltages
to the
squelch circuitry
+4.8
Vdc (VB)
to the
audio processing circuitry
The SSCB utilizes
the station ground to form the
audio ground
(TP7
and TP11),
static ground, and
logic ground (TP2).
68P81092E02
3/19/04
1-11
MSF
5000
Instruction Manual
Chapter
1
Description
SSCB
Functional Description
SSCB
Functional Description
DC-DC Converter
-The
DC-DC
converter provides reference voltages for the
SSCB
and other circuits
of
the
Control
Tray.
The
DC-DC
converter also provides various self and system
protection circuits. Figure
1-4
shows
a
block diagram of
the
DC-DC
converter.
TPS
P6
®
+9.6
VDC
I
+9.6
VDC
+5
VDC
A++
(18.8
VDC)
A++
(13.8
VDC)
DC-DC
CONVERTER
Art
(13.8
VDC)
CIRCUITRY
RESET_SWITCH
VA
(4+4VDC),
VB
(44.8
VDC),
VC
(+4.4
VDC), VD
(+3.8
VDC)
LOW VOLTAGE/POWER UP
RESET
TTAC, SECURE
EXP
BUS
SSCB, RF TRAY
TTRC, SECURE
ExP
BUS
MSFI087
021894JNM
Figure
1-4
DC-DC
Converter
Block
Diagram
Reference Voltages
The station Power Supply
generates an unfiltered
Aux
+13.8
Vdc (A++)
routed to
the
SSCB,
TTRC,
and Expansion Tray. It is then filtered
within
the
SSCB
to +13.8
Vdc (A+).
The voltage regulator in
the
RF
Tray
generates +9.6
Vdc
also routed to
'
the
SSCB.
The
DC-DC
converter
circuitry
generates
and/or
routes:
0
+9.6
Vdc
(measured at
TP5)
to the
TTRC, EXP
Bus, and Secure board
+5.0
Vdc
(measured at
TP6)
to the
SSCB
and
RF
Tray
+13.8
Vdc (A++)
to the
TTRC, EXP
Bus, and Secure board
+4.6
Vdc (VA),
+4.4
Vde
(VC),
+3.8
Vdc (VD)
reference
voltages
to the
squelch circuitry
+4.8
Vdc (VB)
to the
audio processing circuitry
The SSCB utilizes
the station ground to form the
audio ground
(TP7
and TP11),
static ground, and
logic ground (TP2).
68P81092E02
3/19/04
1-11
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