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3.1 Backplane Features
3.1.1 Power Distribution
Power is supplied to the Smart Star control system from an external source through header
J1 on the backplane. The +5 V circuitry on the Smart Star control system is protected
against reverse polarity by a Schottky diode as shown in Figure 6.
+V_USER
J1
1
+RAW
SWITCHING VOLTAGE
REGULATOR
+5 V
2
3
Figure 6. Smart Star Control System Power Supply Schematic
A capacitor provides surge current protection for the voltage regulator, and allows the
external power supply to be located some distance away from the Smart Star control sys-
tem. A switching power regulator is used. The +RAW input voltage may range from 9 V to
30 V (15 V to 30 V you plan to use a D/A Converter Card).
The backplane has inputs for two separate power supplies on header J1, +RAW and
V_USER . The +RAW power supply goes to the switching power regulator, which outputs
the +5 V DC used by the CPU Card and by the I/O cards plugged into the backplane. The
V_USER connection allows a different voltage to be available on the I/O cards for future
development.
NOTE: Always connect V_USER to +RAW with a jumper wire between terminals 1 and 2
on header J1 for the development activities described in the Smart Star manuals.
28
Smart Star (SR9000)
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