Appendix B. Power Supply; Power Supplies - Z-World Wolf BL2600 User Manual

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.
RAW
J12
D41
1
1B220
4
TVS1
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 regulated +5 V DC power supply is
used to drive a regulated +3.3 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.
User's Manual
A
PPENDIX
SWITCHING POWER REGULATOR
1 4
U15
C25
2
47 µF
LM2576
Figure B-1. BL2600 Power Supply
B. P
OWER
LINEAR POWER
REGULATOR
+5 V
330 µH
L1
C22
D42
330 µF
B220
ANALOG POWER
4.7 W
±12 V
POWER
SUPPLIES
GND
S
UPPLY
+3.3 V
LM1117T
U10
3 2
C44 1 C44
10 µF
10 µF
+5 V
SUPPLY
R56
C24 C23
10 µF 0.1 µF
R57
0 W
C78
0.1 µF
AGND
79