V048K020T080 Datasheet, PDF (14/15 Pages) Vicor Corporation – VI Chip - VTM Voltage Transformation Module

Application Note (continued)
PRELIMINARY
Input Impedance Recommendations
Input Fuse 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.
V•I Chips are not internally fused in order to provide flexibility
in power system configuration. However, input line fusing of
V•I Chips must always be incorporated within the power system.
A fast acting fuse, such as NANO2 FUSE 451 Series 7 A 125 V,
is required to meet safety agency Conditions of Acceptability.
The input line fuse should be placed in series with the +IN port.
Anomalies in the response of the source will appear at the output
of the VTM, multiplied by its K factor of 1/24. 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
over voltage shutdown.
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.
Vicor Corporation
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V•I Chip Voltage Transformation Module V048K020T080 Rev. 1.2 Page 14 of 15