Specifications

Chapter 5 – Power Supplies for PL Smart Transceivers
164 PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Boo
k
A Pre-Verified Isolated Switching Supply
When significant application current is required and small size, universal input, safety isolation and/or good
efficiency are also desired, the power supply described in this section is an excellent choice. This design is based on
the STMicroelectronics VIPer
®
20A off-line switch-mode power supply IC.
This pre-verified power supply provides a total output current of 363mA at 12V. It thus supports 100mA of
application and I/O current after allowing for 250mA of the worst case V
A
current and 13mA of worst case V
DD5
current of a PL 3120 or PL 3170 Smart Transceiver IC. The specifications for this supply are listed in Table 5.6, the
application schematic is provided in Figure 5.7, the bill of material (BOM) is provided in Table 5.7 and a
recommended PCB layout is provided in Figure 5.8.
Table 5.6 Pre-Verified Isolated Switching Supply Specifications
Parameter Min Typ Max Units
Input voltage 90 230 254 VAC
V
A
output voltage 10.8 12.4 14.0 VDC
V
DD5
output voltage 4.75 5.0 5.25 VDC
Output load current (V
A
+V
DD5
) 10 150 363 mA
Switching frequency 46 51 55 kHz
Ambient operating temperature -40 25 85 C