24646R Datasheet 24646R | P4-P6

Micro DC-DC Converter Evaluation Board Rev. 1.0

Page 4

Thermals

For most lab environments a fan blowing across the

valuation board and appropriate heat sinking is

recommended. A variety of heat sinks are available from

Vicor. See Figure 4 for the proper installation of the

converter and heat sink.

For additional information on thermal management refer

to the application note “Thermal Considerations: Assuring

Performance of Maxi, Mini and Micro High-Density DC-DC

Converter Modules” and the Maxi, Mini, Micro Design

uide and Applications Manual.

Recommended Hardware

Mounting hardware included with the Evaluation Board is

compatible with slotted baseplate converters only.

The provided hardware includes:

Quantity Description

6 0.325” F-F standoff

6 4-40, 3/16" screw

Vicor P/N

6 4-40, 1/2" screw

18150

6 Self adhesive rubber foot

12 0.44 OD 0.203 ID brass washer

8 10-32 hex nut with star lock washer

4 4-40, 5/16" screw

Ring lugs are also recommended.

Figure 4: Heat sink installation stackup

Through Hole, 0.9” Fin

Transverse Heat Sink

Vicor P/N 30725*

(Recommended)

Thermal Pad

Vicor P/N 20265*

(Recommended)

(4)

P/N 19145

screws

(4)

P/N 19141

screws

Micro DC-DC converter*

(4)

P/N 19126

standoffs

*Not included with evaluation board.

}

Micro DC-DC Converter Evaluation Board Rev. 1.0

Page 5

Basic Evaluation

utput Voltage Measurement Jack (J1)

This connector is provided to make accurate measurements

of the output voltage of the DC-DC converter. Many types

of scope probes may be directly connected to this point

if the probe is equipped with a removable plastic sheath.

To avoid creating ground loops when making

measurements of the output or input voltage, these

measurements should be made separately.

Input Current Measurement

A current probe can be passed around the +IN lead

connected to the converter. Input capacitors on the

Evaluation Board are downstream of this

measurement point.

fficiency Measurement

As the Micro DC-DC converter can deliver and consume

large currents, the effect of the PCB must be considered

when making an efficiency measurement. Be certain to

accurately measure the voltage directly at the DC-DC

converter using the provided Kelvin input and output

connections.

Paralleling

There are several suggested configurations for paralleling

Vicor converters. The most appropriate will depend on

the application. To parallel two converters with a dedicated

booster for output power expansion and isolated PR bus

use the following procedure. Paralleling more than two

evaluation boards is not recommended.

Figure 5: Micro DC-DC converter Evaluation Board schematic

+IN(K)

+OUT

-OUT

-IN

+IN

Micro

DC-DC Converter

PR-

PR+

-IN(K)

+OUT(K)

-OUT(K)

0.01 µF

200 V

4.7 nF

250 V

4.7 nF

250 V

4.7 nF

250 V

4.7 nF

250 V

100 µF

450 V

IN(E1)

Gnd

-IN(E2)

+OUT(E3)

-OUT(E4)

Figure 6: Paralleled Evaluation Board, wire gage is suitable for high input and output voltage converters

Micro DC-DC Converter Evaluation Board Rev. 1.0

Page 6

1. Add PR coupling transformers (Vicor P/N 29768) in the

space provided on the input side of two Evaluation Boards.

The same model of converter must be installed in each

oard along with an appropriate input fuse.

2. Connect the PR+ of the first board to the PR+ of the

second board with one half of a short section of twisted

pair. With the other half do the same for the PR- of the

Evaluating Boards, Figure 7. The PR signal is a very fast

pulse and requires a interconnect with good signal integrity.

Do not use coaxial cable for the interconnect.

3. Connect the inputs and outputs of the evaluation

boards in parallel with appropriately sized leads.

4. Connect the SC connection to –OUT(K) on one of the

Evaluation Boards, Figure 8. The converter on this board is

now a dedicated booster and cannot process power

without receiving a PR signal from another converter.

To test the array, verify that both converters provide roughly

half the load current. The array will be capable of producing

twice the power of an individual converter.

For other paralleling configurations and procedures see the

Maxi, Mini, Micro, Design Guide and Applications Manual.

Caution

The Micro DC-DC converter and Evaluation Board can

comfortably operate at surface temperatures which may

pose a thermal hazard to the operator. Be careful not to

touch any exposed surface. The Evaluation Board is not

intended for use in end item equipment.

Micro DC-DC converters operate at hazardous voltages

that will be present at the surface of the Evaluation Board.

Proper safety steps should be taken when using the

Evaluation Board.

For further information on evaluation boards contact

Vicor Applications Engineers at 1-800-927-9474 or

vicorpower.com/support/ for worldwide assistance.

Figure 7: PR transformer and isolated PR bus

Figure 8: Output connections, lower module is a dedicated booster

P1-P3 P4-P6

24646R

Mfr. #:

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Description:

Power Management IC Development Tools ASSY DEMO BD

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