PRD48AF480T400A00 Datasheet, PDF (9/9 Pages) Vicor Corporation – PRM-AL Customer Evaluation Boards

The DC-DC Converter Chip Set
The PRM® and VTM® evaluation boards allow the user to select and configure the PRM®
and VTM to the unique application requirements of their system. By selecting the PRM
to accept the desired input voltage, one need only select the VTM to provide the desired
output voltage and plug them together if the nominal voltages are all that are required.
Refer to UG:0014 for information on the VTM evaluation board.
Figure 5.
PRM-AL and VTM
Evaluation Boards
(plugged together)
Rev 1.2 08/14
To provide for load regulation at the output of the VTM, the Adaptive Loop regulation
mode should be engaged. To activate this feature of the PRM-AL, the switch indicated
CD (switch #4) should be set to the ON position. The corresponding trim pot should be
set to compensate for the VTM R_OUT, such that the VTM output voltage is regulated at
full load. Be certain to refer to the data sheets for the appropriate resistor values for your
requirements.
To validate the functionality of the Adaptive Loop regulation, repeat the steps of 2.0
to 5.0 under the section Baseline Test Procedure - PRM-CB except in this instance the
output connections are to be made to the VTM-CB output terminals. Both the PRM and
VTM data sheets should be in hand. The load current refers to the VTM output current
ratings. Be certain to make the connections to the supply and load prior to mating the
boards to avoid stressing the connectors.
The PRM Adaptive Loop regulates the output of the VTM without sense lines. The
Factorized Bus voltage (Vf) may be moniored by using J02 on the PRM-CB board (Item
9) while increasing the load current. Observe the Vf voltage increases with the load
current, compensating for the insertion loss due to the VTM output resistance.
VTM output voltages, which deviate from the nominal configuration, are available by
changing the output set point of the PRM as described in section 6 of this document and
using the formula described in the data sheet.
Ordering Information
The PRM-AL Customer Evaluation Boards are specified by add the suffix “-CB” to the
appropriate PRM model number.
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