3.3.5 Power Supply System
The PL460-EK board requires two power sources, as shown in Table 3-9.
| Power Input | Voltage | Max Power |
|---|---|---|
| DC Input connector (J4) | 15V (±5%) | 12W |
| Xplained PRO connector (J2) | 3.3V | — |
The PL460-EK board has two voltage rails:
- +12V to power the PL460 amplification stage
- +3.3V to power the low voltage domain of PL460
The +12V rail is supplied by an external 15V 12W AC/DC Wall adapter connected through the DC Jack connector (J4) schematized in Figure 3-15.
A switched-mode power supply (SMPS) with Buck topology is used to generate the 12V power supply from 15V input (Vdc). The LED D21 and the test point TP13 are connected to the voltage rail to check whether the power supply is operating properly. The jumper J5 allows measuring the current on the 12V rail.
Attention: To avoid noise
interferences, the switching frequency of the external SMPS must be out of the PLC band and
preferably in frequencies above it to avoid harmonics influence. This is essential to
obtain a good reception performance.
Tip: Before starting to transmit, make sure that the 12V
power supply is applied and stable to avoid damaging the driver. So, the DC Input Connector
must be connected and shunt JP1 must be installed on J5.
In normal operation (Client board hosted by Xplained PRO Host), Xplained PRO will provide the 3.3V power supply.
