User's Manual Part 2

Driver Section - 79 -
®
Affinity LBD-200C-N1 Transmitter
Product Manual
Power Supply Plug-In Module Upconverter Module
11.1 Power Supply Plug-In Module
The Power Supply Plug-In Module provides the required DC voltage levels for the various
transmitting system assemblies. The Front-End DC Power Supply Module provides the 48V
DC
source required for the operation of the Power Supply Plug-In Module.
The Power Supply Plug-In Module contains a DC converter board that converts 48V
DC to the
output voltage levels used for the various circuits within the Driver Section and transmitter
assemblies. The Power Supply Plug-In Module generates +24V
DC, +12VDC, +8VDC, +5VDC,
and -12V
DC. The enable logic of the controller directs the on and off functionality of the +24VDC,
+12V
DC and +8VDC supplies. The -12VDC and +5VDC supplies are independent and not
switched by the positive enable logic.
+12V
DC: A DC-to-DC converter within the Power Supply Module transforms the 48VDC to
12V
DC. The 12VDC supply is fuse protected. The 12VDC supply is filtered on the output to
attenuate ripple from the input source and DC-to-DC converter. An LED located on the front
panel of the Power Supply Plug-In Module confirms the DC-to-DC converter operation. This DC-
to-DC converter provides all of the remaining power requirements of the Driver. The converter is
mounted underneath the DC converter PCB, and directly onto the extrusion. This extrusion
facilitates the thermal dissipation of energy from the DC-to-DC converter.
A positive voltage enabled switch controls the application of +12V
DC to the remaining plug-ins
within the Driver. Additionally, the positive voltage enabled switch controls the application of the
12V
DC to the 24VDC, and the +8VDC power supplies. These supplies also provide the
operational power to the rest of the system.
+24V
DC: A switching power supply steps-up, filters and regulates the 12VDC to generate the
24V
DC. Diodes protect the regulator from reverse and over-voltage load conditions. The output
of this power supply is fused to prevent damage to the power supply circuit during transitional
overloads. Since the positive voltage enabled switch controls the supply voltage to this power