V048K120T025 Datasheet, PDF (14/15 Pages) Vicor Corporation – V, I ChipTM-VTM Voltage Transformation Module

Application Note (continued)
PRELIMINARY
V•I Chip Voltage Transformation Module
Input Impedance Recommendations
To take full advantage of the VTM’s capabilities, the impedance of the
source (input source plus the PC board impedance) must be low over a
range from DC to 5 MHz. The input of the VTM (factorized bus) should be
locally bypassed with a 8 µF low Q aluminum electrolytic capacitor.
Additional input capacitance may be added to improve transient
performance or compensate for high source impedance. The VTM has
extremely wide bandwidth so the source response to transients is usually
the limiting factor in overall output response of the VTM.
Anomalies in the response of the source will appear at the output of the
VTM, multiplied by its K factor of 1/4 . The DC resistance of the source
should be kept as low as possible to minimize voltage deviations on the
input to the VTM. If the VTM is going to be operating close to the high
limit of its input range, make sure input voltage deviations will not trigger
the input overvoltage turn-off threshold.
Input Fuse Recommendations
V•I Chips are not internally fused in order to provide flexibility in
configuring power systems. However, input line fusing of V•I Chips must
always be incorporated within the power system. A fast acting fuse is
required to meet safety agency Conditions of Acceptability. The input line
fuse should be placed in series with the +In port.
Warranty
Vicor products are guaranteed for two years from date of shipment against defects in material or workmanship when in normal use and service. This
warranty does not extend to products subjected to misuse, accident, or improper application or maintenance. Vicor shall not be liable for collateral or
consequential damage. This warranty is extended to the original purchaser only.
EXCEPT FOR THE FOREGOING EXPRESS WARRANTY, VICOR MAKES NO WARRANTY, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Vicor will repair or replace defective products in accordance with its own best judgement. For service under this warranty, the buyer must contact Vicor
to obtain a Return Material Authorization (RMA) number and shipping instructions. Products returned without prior authorization will be returned to the
buyer. The buyer will pay all charges incurred in returning the product to the factory. Vicor will pay all reshipment charges if the product was defective
within the terms of this warranty.
Information published by Vicor has been carefully checked and is believed to be accurate; however, no responsibility is assumed for inaccuracies. Vicor
reserves the right to make changes to any products without further notice to improve reliability, function, or design. Vicor does not assume any liability
arising out of the application or use of any product or circuit; neither does it convey any license under its patent rights nor the rights of others. Vicor
general policy does not recommend the use of its components in life support applications wherein a failure or malfunction may directly threaten life or
injury. Per Vicor Terms and Conditions of Sale, the user of Vicor components in life support applications assumes all risks of such use and indemnifies
Vicor against all damages.
vicorpower.com 800-735-6200
V•I Chip Voltage Transformation Module
V048K120T025
Rev. 1.0
Page 14 of 16