V048F080T030-CB Datasheet, PDF (9/9 Pages) Vicor Corporation – PRM® and VTM® Customer Evaluation Boards

For example, if a P048F048T24AL-CB and a V048F120T025-CB are mated as above, the input range
to the pair is 36 – 75 Vdc and the output would be 12 Vdc at no load decreasing by Iout x Rout of
the VTM^® as the load current increases. This Vout decrease is due to the switch bank being configured
as shown in the silk screen. In this configuration, the PRM^® is set for Local Loop mode as described in
Section 5d.
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 19.2 Ω which will result in a total CD
to SG resistance of 39.2 Ω. This is the optimal value for the nominal PRM output voltage as set by the
fixed OS resistor installed on the board and activated by the OSF (switch #6) in the ON position. 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 and VTM Customer Evaluation Boards are specified by add the suffix “-CB” to the
appropriate PRM or VTM model number.
Go to http://www.vicorpower.com/contact-us for ordering information.
12/2013
vicorpower.com
Applications Engineering: 800 927.9474
Rev 1.1
Page 9