User’s Manual
79
A
PPENDIX
B. P
OWER
S
UPPLY
Appendix B describes the power circuitry provided on the
BL2600.
B.1 Power Supplies
Power is supplied to the BL2600 via the friction-lock connector at J12. The BL2600 is
protected against reverse polarity by a diode at D1 as shown in Figure B-1.
Figure B-1. BL2600 Power Supply
The input voltage range is from 9 V to 36 V. A switching power regulator is used to pro-
vide +5 V for the BL2600 logic circuits. In turn, the reg5 V DC power supply is
used to drive a reg3.3 V power supply and ±12 V power supplies used by the op-
amps driving the digital outputs.
The digital ground and the analog ground share a single split ground plane on the board,
with the analog ground connected at a single point to the digital ground by a 0
Ω
resistor
(R57). This is done to minimize digital noise in the analog circuits and to eliminate the
possibility of ground loops. External connections to analog ground are made on a polar-
ized friction-lock connector at J8.
LINEAR POWER
REGULATOR
POWER
IN
J12
C44
10 µF
LM1117T
U10
+3.3 V
3
1
2
1
4
1B220
D41
47 µF
C22
330 µF
+5 V
L1
C25
330 µH
D42
B220
SWITCHING POWER REGULATOR
U15
LM2576
RAW
1
4
2
C44
10 µF
TVS1
C78
0.1 µF
C23
0.1 µF
C24
10 µF
R56
4.7
W
R57
0
W
+5 V
ANALOG POWER
SUPPLY
AGND
GND
±12 V
POWER
SUPPLIES
Содержание Wolf BL2600
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