B.3 Power Supply
The RCM3360/RCM3370 requires a regulated 3.15 V to 3.45 V DC power source to oper-
ate. Depending 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 diode at D1 as
shown in Figure B-3.
J4
SWITCHING POWER REGULATOR
+5 V
LINEAR POWER
REGULATOR
+3.3 V
DCIN
1
2
3
D1
DL4003
C1
47 μF
U1
LM2575
330 μH
L1
D2
1N5819
330 μF
3
10 μF
LM1117
U4
1
2
10 μF
Figure B-3. Prototyping Board Power Supply
User ’s Manual
81
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