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The nominal output voltage of Vicor's DC-DC converter can be trimmed up or down within a specified range. With a few exceptions, VI-200 / VI-J00 DC-DC converters can be adjusted between -50% and +10% (refer to VI-200 and VI-J00 data sheets for limitations). All our Maxi, Mini and Micro converters can be trimmed down to 10% or up to 110% of nominal output voltage.
Fixed output trimming can be achieved using a single resistor or by using a potentiometer when variable outputs are required. The use of an OpAmp or DAC gives you more flexibility to change the output voltage dynamically. Care has to be taken to limit the maximum voltage deviation of the control pin to that of the corresponding trim range percentage. Usually a minimum pre load is necessary to reach the lowest output voltage. Please contact Vicor's applications engineering for more details.
The trimming resistors, potentiometer, or active circuitry are connected to TRIM (VI-200 and VI-J00) or to SC (Maxi, Mini and Micro) respectively, and are referenced to the –SENSE pins. Due to the lack of SENSE pins in our Micro modules, the trimming resistors are referenced to the -OUT and +OUT. To avoid noise being introduced into the module, the trim components should be located close to the module's pins.
For convenience, we provide trimming calculators for fixed and for variable output trimming on our web page. Please see both links below.
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