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BL4S200 User’s Manual
178
A
PPENDIX
B. P
OWER
S
UPPLY
Appendix B describes the power circuitry provided on the
BL4S200.
B.1 Power Supplies
Power is supplied to the BL4S200 boards via the Micro-Fit
®
connector at J5. The
BL4S200 is protected against reverse polarity by a diode at D10 as shown in Figure B-1.
Figure B-1. BL4S200 Power Supply
The input voltage range is from 9 V to 36 V. A switching power regulator is used to provide
+5 V for the BL4S200 logic circuits. In turn, the reg5 V DC power supply is used
to drive two reg3.3 V power supplies and ±12 V power supplies used by the op-
amps driving the outputs. A se3.3 V power supply is provided for the RabbitCore
module to ensure adequate capacity for its circuits.
LINEAR POWER
REGULATOR
POWER
IN
J5
C9
10 µF
LM1117T
U3
+3.3 V
3
1
2
1
3
B240
D10
47 µF
C10
330 µF
+5 V
L1
C5
150 µH
D9
B240
SWITCHING POWER REGULATOR
U2
LM2576
RAW
1
4
2
C11
10 µF
C123
0.1 µF
C109
10 µF
R88
4.7
W
R95
0
W
+3,3 V
ANALOG POWER
SUPPLY
AGND
GND
±12 V
POWER
SUPPLIES
LINEAR POWER
REGULATOR
C4
10 µF
+3.3 V
C6
10 µF
LM1117T
U1
3
1
2
Power Supply to
RabbitCore Module