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Class II encapsulated power supplies operate in high ambient temperatures

Posted : 30 Jun 2016

TDK Corporation announces the introduction of the KWS-A series of single output 5W to 25W encapsulated power supplies 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 compact package sizes.  The 5W and 10W units measure 38.1 x 25.4 x 21.5mm, the 15W 50.8 x 25.4 x 24mm and the 25W models 63.5 x 25.4 x 29mm.  Four popular output voltages are available, 5V, 12V, 15V and 24V, and all operate from a wide range 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 as high as 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.