Wide Range Trimming with Variable Loads

February 20, 2007
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Vicor Maxi, Mini and Micro modules can be programmed from 10 to 110% of their nominal output voltage. If the system always has a sufficient minimum load, trimming down is easily accomplished with a small low power resistor or potentiometer.

With a wide trim range, a preload is often needed to maintain a stable trimmed voltage, especially at light loads. A minimum load is frequently required, typically when the output is programmed below 75% of nominal, but it is always required if it is trimmed below 25%.

Figure 1 – Typical preload current for a given output voltage

 

Click here to go to an article that explores this topic further and presents two simple preload circuits. These circuits automatically turn on when required and vary in value according to the load on the system.

 

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