Technical Manual

Power Supply
Appendix A - UHF Circuit Descriptions
A-16
ATLAS 4500 Multimode Station Technical Manual July 2021
A.6 Power Supply
This section contains information on the following Power Supply components:
• Mains-to-48V PSU
• Filters
• Switch Mode DC-to-DC Convertors
A.6.1 General Description
The base station main power supply contains the following:
• 100 – 240 VAC-to-48 VDC supply
• Mains Filter, 48 V I/P and 3 O/P Filters.
• DC to DC 5.2 V PSU
• DC to DC 13.8 V PSU
• DC to DC 24 V PSU
• Cable and connector to main Controller PCB and PA.
• Shielded case
A.6.2 Schematic Description
A.6.2.1 Mains-to-48V PSU
The base station uses a switch mode power supply 100 – 240 VAC input, 48 V 10.5
A, 500 W output. This has a temperature controlled cooling fan inside.
A.6.2.2 Filters
The General power supply board has an EMI filter of the AC mains (inside PSU)
and filter networks on the 48 V DC O/P for ripple and RFI noise.
The 3 DC to DC convertors outputs have filter networks to filter RFI noise.
A.6.2.3 Switch Mode DC-to-DC Convertors
The 48V supply is DC / DC converted to 5 V by IC2, 13.8 V by IC1 and 24 V by
IC3.