Specifications

Chapter 5 – Power Supplies for PL Smart Transceivers
154 PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Boo
k
Introduction
In order to preserve the full communications capability of the PL Smart Transceiver, it is important to ensure that the
power supply does not impair communication performance. If not properly designed, a power supply could attenuate
the communication signal and couple noise into the transceiver - since the input of the supply is connected directly to
the communication channel. Likewise, without proper design, the power supply outputs, V
DD5
and V
A
, have the
potential to degrade performance by coupling noise into the PL Smart Transceiver through its supply terminals.
In order to minimize time required to implement a successful product design, several “pre-verified” power supply
options (where an instance of the supply has been verified to meet all the PL Smart Transceiver noise and impedance
requirements) are documented in this chapter. While testing a product incorporating one of these designs is still
necessary, due to differences in layout, use of a pre-verified supply can significantly reduce development time. For
those who wish to design their own unique supply, or embed a PL Smart transceiver into a product with an existing
supply, the information necessary to accomplish this without impairing communications is also provided in this chapter.
The pre-verified power supplies listed in this chapter support the transceiver reference designs from Appendix A that
incorporate the standard PL transmit amplifier with a 1Ap-p current limit. While the voltage and current
requirements for the optional 2Ap-p reference amplifier differ, the noise and impedance requirements from this
chapter are also applicable to design of a supply that supports this optional high power amplifier. The voltage and
current requirements for the PL Smart Transceiver and Reference circuitry are listed in Tables 5.1 through 5.3 below.
Table 5.1 Power Supply Requirements for PL 3120, PL 3150 and PL 3170 Smart Transceivers ICs
Symbol Parameter Min Typ Max Unit
V
DD5
V
DD5
5V PL IC Digital Power Supply 4.75 5.00 5.25 V
V
DD5A
V
DD5A
5V PL IC Analog Power Supply 4.60 5.00 5.25 V
I
DD
PL 3120/PL 3170 Smart Transceiver V
DD5
+V
DD5A
Supply
Current (not including I/O or internal pull-up current)
9 13 mA
I
DD
PL 3150 Smart Transceiver V
DD5
+V
DD5A
Supply Current
(not including I/O or internal pull-up current)
12 16 mA
Table 5.2 Power Supply Requirements for Standard 1Ap-p Transmit Amplifier Reference Circuit
Symbol Parameter Min
Typ
Max Unit
V
ARX
V
A
Supply Voltage - Receive mode 8.5 12.0 18.0 V
V
ATX
V
A
Supply Voltage - Transmit mode (1), (2) 10.8 12.0 18.0 V
I
ARX
V
A
Supply Current - Receive mode 350 500 μA
I
ATX
V
A
Supply Current - Transmit mode 120 250 mA
Table 5.3 Power Supply Requirements for Optional 2Ap-p Transmit Amplifier Reference Circuit
Symbol Parameter Min Typ Max Unit
V
ARX
V
A
Supply Voltage - Receive mode 12.0 15.0 18.0 V
V
ATX
V
A
Supply Voltage - Transmit mode (2) C-band
A-band
14.25
12.0
15.0
15.0
18.0
18.0
V
V
I
ARX
V
A
Supply Current - Receive mode 350 500 μA
I
ATX
V
A
Supply Current - Transmit mode 160 500 mA