RECOM PCB-mount AC/DC converters feature ultra-wide input for global single and three-phase applications, rated 5W/15W/25W
While three-phase AC supplies are used for high-power loads, there is often a need to generate low-power auxiliary DC rails from the same source. Typically, this is either from line to neutral at 400VAC, or line to line at 480VAC or 277VAC nominals. This can be achieved efficiently and conveniently with AC/DC modules with an input range of 85VAC to 528VAC, including the highest nominal voltage and tolerances. The operation to 85VAC minimum also makes the parts compatible with single-phase AC supplies down to 100VAC nominal. AC/DC modules connected to three-phase supplies normally need to withstand higher voltage transients than those connected to single-phase AC within buildings. The modules, therefore, need to be rated Over-Voltage Category III (OVC III) minimum. Similarly, AC/DC modules connected to three-phase AC are often situated in harsh environments and should therefore be robust, able to operate at high temperatures, and ideally be encapsulated with Pollution Degree 3 (PD3) rating. Compliance with EMC standards for emissions and immunity must also be met, along with no-load power consumption limits. Suitable modules are available from RECOM with power ratings of 5W, 15W, and 25W in through-hole PCB mount format.