How do you adjust the output voltage of a power supply?
The output voltage of a power supply is usually a fixed voltage, but sometimes it may be necessary to adjust that output voltage. For example, you may be able to reduce the power dissipation in a low-voltage high-current processor – while still keeping performance high – by adjusting the voltage fed to the core.
Does an AC-DC power supply have an output voltage adjustment?
AC-DC power supplies and DC-DC converters often feature an output voltage adjustment, the range of which is stated in the datasheet. An AC-DC power supply may have a potentiometer accessible to set the output voltage from the original factory set point. (See Figure 1).
What is an adjustable output power supply (AVS)?
Using AVS allows the processor to optimize the core voltage, thus improving performance and reducing power dissipation. This is just one example of how to create an adjustable-output power supply. For more information, see my latest Power Tips post on EETimes.
How does an AC-DC power supply work?
An AC-DC power supply may have a potentiometer accessible to set the output voltage from the original factory set point. Board mount DC-DC converters may also have an output voltage adjustment range, usually achieved via the “trim” terminal. The trim connection is either pulled high or low via a resistor depending on the product.
Why is my DAC output voltage different?
Any noise or voltage drop at the DAC output will cause unexpected output voltage variation. It should also be noted that when adjusting the output up in voltage, the maximum power rating of the power supply or converter is not exceeded. Likewise the maximum current must not be exceeded when the voltage is below the nominal set point.
Why do board mount DC-DC converters have a voltage adjustment range?
Adjusting the output voltage may be needed to compensate for voltage drops in the load cables, or to optimize the load’s performance or efficiency. Board mount DC-DC converters may also have an output voltage adjustment range, usually achieved via the “trim” terminal.
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Update following some of the comments: Most electronic power supplies will have a built-in current limiting circuit. If the supply is rated for 6 V, 1 A I would expect that this should be the minimum guaranteed output and that it may even maintain 6 V at 1.1 or 1.2 A.
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