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User’s Manual
75
A
PPENDIX
B. P
OWER
S
UPPLY
Appendix B describes the power circuitry provided on the
Coyote.
B.1 Power Supplies
Power is supplied to the Coyote via the friction-lock connector terminal at J2. The Coyote
has an o5 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. The Coyote is protected
against reverse polarity by a diode at D1 as shown in Figure B-1.
Figure B-1. Coyote Power Supply
The input voltage range is from 8 V to 40 V DC.
There is provision on the printed-circuit board for a transorb to be installed at TVS1 in
parallel with C1 to provide suppression for positive noise pulses above 51 V. This part is
only needed when the Coyote will be used in industrial environments where a clean source
of power cannot be guaranteed, and is not part of the normal factory build.
LINEAR POWER
REGULATOR
POWER
IN
J2
10 µF
LM1117
U10
+3.3 V
3
1
2
1
2
1N5819
D1
47 µF
340 µF
+5 V
L1
C1
330 µH
D2
1N5819
SWITCHING POWER REGULATOR
DCIN
U3
LM2575
DCIN
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