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In the Econoline unregulated series (/P option), how does the continuous short circuit protection operate?
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If the output is overloaded, the FET series resistor limits the maximum output current. But if the output is short circuited (<0.1 Ohm), an additional mechanism comes into effect: The magnetic coupling between the primary winding and the feedback winding is disturbed by the shorted secondary winding. The result is to reduce the output current still further to create a current fold back characteristic. Once the short is removed, the magnetic coupling between the primary and feedback coils is re-established and the converter reverts to normal operation.
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I am using one of your unregulated converter, but my output voltage is much higher than the tolerance specified in the Datasheets.
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The unregulated converters have a deviation curve depending on the load. The lower the load is, the higher the output voltage. Please check the graphs included in our Datasheets about Deviation/Load. Usually, these converters need at least 20% load.
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What’s the difference between unregulated and regulated converters?
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An unregulated converter is a cheaper solution but offers less stability over the output voltage. The output voltage can change depending on both the load and the Input voltage variations. Therefore, the input voltage range is restricted to +/-5% or +/-10% and the output voltage can rise substantially during no-load conditions. However, even an unregulated converter offers a low +/-5% output voltage variation over the load range of 20% to 100%.
Regulated converters offer a much better load and line voltage regulation, typically less than 1%, so the output voltage is not dependant on the load or input voltage. In addition, the input voltage range is higher (2:1, 4:1 or up to 7:1 with non-isolated converters).
