MVTD36BF015M080A00 Datasheet MVTD36BH090M010A00, MVTD36BH030M025A00, MVTD36BF360M003A00 | P7-P9

UG:003 vicorpower.com Applications Engineering: 800 927.9474 Page 7

VTM-CB (Figure 4)

he VTM

odule provides the isolation stage and the output voltage step down. When paired with

the PRM the chip set forms a traditional DC-DC converter. The -CB board for the VTM is intended to

be used in conjunction with the PRM-CB; nevertheless, in order to test this standalone, it is possible to

inject a VC pulse as specified in the data sheet to the exposed lead from the header corresponding to

the VC pin. Refer to the board schematic Figure 5 for the appropriate pin(s.) An impedance

measurement may prove just as expeditious.

Board Overview

1 Source voltage input points (Item 1) are designed to accommodate #10 hardware and Panduit ring

lugs. BE CERTAIN POLARITY IS CORRECT BEFORE APPLYING POWER.

2 Input connector J01 (Item 2) mates with PRM-CB providing Vin and VC. As can be seen from the

following schematic there are four pins dedicated to the + In, four for the -In, and two for the

VC. Each contact is rated for 3 A. The excess capacity afforded by these pins can facilitate testing

multiple VTM-CBs from a single PRM-CB using an appropriate wiring harness and mating

connector. This may also be achieved using the large pads of Item 1.

Note: There is a removable male to male insert installed into this connector. This allows the

mate to be either gender which may be important depending upon the availability of connectors.

3 The Kelvin connection points for Vin and Vout (Item 3) are for use in efficiency measurements.

4 The scope jack (Item 4) is used to view output voltage parameters.

5 Output voltage points (Item 5) are designed to accommodate #10 hardware and Panduit

ring lugs.

Figure 4

VTM-CB

UG:003 vicorpower.com Applications Engineering: 800 927.9474 Page 8

Figure 5 is the schematic for this PCB. Double clicking the image will launch Adobe Acrobat to allow

you a better view.

The DC-DC Converter Chip Set

The -CB boards in Figure 6 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.

Figure 5

VTM-CB schematic diagram

Figure 6

CB boards

vicorpower.com Applications Engineering: 800 927.9474 Rev 1.1 Page 9

12/2013

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

e 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.

P1-P3 P4-P6 P7-P9

MVTD36BF015M080A00

Mfr. #:

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Power Management IC Development Tools Evaluation Board for MVTM36BF015M080A0

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MVTD36BF015M080A00

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