HMS Anybus CompactCom B40 Modbus Serial User Manual page 48

Appendix E: Implementation Guidelines
E.3.2 Bypass Capacitance
The power supply inputs must have adequate bypass capacitance for high-frequency noise
suppression. It is therefore recommended to add extra bulk capacitors near preferably all the
power supply inputs (or at least two):
Reference
C1
GND
Fig. 26
E.3.3 3.3 V Regulation
The following example uses the LT1767 from Linear Technology to provide a stable 3.3 V power
source for the module. Note that all capacitors in this example are of ceramic type.
5V
22uF
(6.3V)
Fig. 27
For detailed information regarding this example, consult the data sheet for the LT1767 (Linear
Technology).
Anybus ® CompactCom ™ B40 Modbus Serial User Manual
Value (Ceramic)
10 µF / 6.3 V
3V3
LT1767
Vin Vsw
SHDN
100nF
Vc FB
(16V)
1,5nF
(50V)
4k7
C1
BAV70
100nF
(16V)
10uH
C1
C2
10uF
(6.3V)
SS14
46 (48)
3.3 V
GND
VDD (3.3V)
GND
SCM-1202-130 1.1 en-US