Tuesday, June 3, 2008

High Voltage Power Supply Selection Issues - Part 2

A couple more high voltage issues to consider:

Some power supplies require a minimum load to regulate correctly. Particularly at low output current and low output voltage, this is a concern. Thus, after the minimum desired operating conditions are determined, it is worthwhile checking with the manufacturer to determine if the selected power supply can operate at those conditions.

It is also worthwhile investigating power supply operation when the output current reaches the limit. Some power supplies exhibit foldback, while others will limit the current to the max value. When the limiting is precise, then it is termed current regulation. Some power supplies can operate in current limit mode indefinitely, while others cannot, and they can overheat or fail.

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