Power Supply - Rabbit RabbitCore RCM5400W User Manual

Table B-1 lists the electrical, mechanical, and environmental specifications for the Proto-
typing Board.
Parameter
Board Size
Operating Temperature
Humidity
Input Voltage
Maximum Current Draw
(including user-added circuits)
Prototyping Area
Connectors
B.3 Power Supply
The RCM5400W requires a regulated 3.0 V – 3.6 V DC power source to operate. Depend-
ing on the amount of current required by the application, different regulators can be used
to supply this voltage.
The Prototyping Board has an onboard +5 V switching power regulator from which a
+3.3 V linear regulator draws its supply. Thus both +5 V and +3.3 V are available on the
Prototyping Board.
The Prototyping Board itself is protected against reverse polarity by a Shottky diode at D2
as shown in Figure B-3.
J1
1
D2
2
DL4003
3
TIP: When you lay out your own power-supply circuit, place the switching voltage regu-
lator as far away from the RCM5400W as possible to minimize RF noise, and use low-
noise components such as a toroid coil.
96
Table B-1. Prototyping Board Specifications
3.80" × 3.80" × 0.48" (97 mm × 97 mm × 12 mm)
0°C to +70°C
5% to 95%, noncondensing
8 V to 24 V DC
800 mA max. for +3.3 V supply,
1 A total +3.3 V and +5 V combined
1.3" × 2.0" (33 mm × 50 mm) throughhole, 0.1" spacing,
additional space for SMT components
One 2 × 25 header socket, 1.27 mm pitch, to accept RCM5400W
One 1 × 3 IDC header for power-supply connection
One 2 × 5 IDC RS-232 header, 0.1" pitch
Two unstuffed header locations for analog and RCM5400W
signals
25 unstuffed 2-pin header locations for optional configurations
SWITCHING POWER REGULATOR
DCIN
U2
C5
47 µF
LM2575
Figure B-3. Prototyping Board Power Supply
Specification
LINEAR POWER
+5 V
JP1
C4
C6
330 µF
10 µF
330 µH
L1
D1
B140
RabbitCore RCM5400W
REGULATOR
+3.3 V
LM1117
JP2
U1
2
3
C2
1
10 µF