Class II encapsulated power supplies operate to 85C ambient

June 30, 2016 // By Graham Prophet
TDK’s KWS-A series of single output 5W to 25W encapsulated power supplies is capable of operating in ambient temperatures of up to 85ºC. With a Class II input, the products require no earth ground connection, making them suitable for use in a range of process control, broadcast, test & measurement and industrial equipment.

The board-mount product line-up comprises four power levels, 5W, 10W, 15W and 25W, and is housed in three package sizes. The 5W and 10W units measure 38.1 x 25.4 x 21.5 mm, the 15W 50.8 x 25.4 x 24 mm and the 25W models 63.5 x 25.4 x 29 mm. Four output voltages are available, 5V, 12V, 15V and 24V, and all operate from an input voltage of 85 – 265Vac, 47 - 440Hz.


The KWS-A can start up at -40ºC and operate without forced air cooling in ambient temperatures of up to 85ºC, and at full load over a -10ºC to +55ºC range (+45ºC for the 5V output 10W to 25W models). Off-load power draw is less than 0.5W and full load efficiencies are up to 88%. Board design is made simpler and space minimised as no external fusing or electrolytic capacitors are required.


The series carries certification to UL/CSA/IEC/EN 60950-1 and the CE mark for the Low Voltage and RoHS2 Directives. All models comply with EN 55011-A conducted and radiated emissions (class B with the addition of a small X-capacitor) and EN 61000-4-2, -6-2 immunity standards.


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