Power supply de-rating in practice

Source: Stephen Dodson, Engineering Manager, XP Power

With mounting market pressure on power supply size, power density and cost there are an increasing number of AC-DC power supplies released which rely on de-rating specifications to improve their headline power ratings.

This de-rating information may not be immediately apparent and is typically located at the end of the product data sheet, well away from the headline data. In some cases the short form or catalogue version of the data does not include this level of detail, so care must be taken when selecting the product to ensure that it is truly suitable for a given application.

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