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Supply stays approved at any voltage

Edited by the Electronicstalk editorial team Feb 28, 2006

A novel AC/DC switching power supply enables users to specify any voltage level up to the maximum rating of each output while still maintaining full agency approvals

XP Power has released an innovative AC/DC switching power supply that enables users to specify any voltage level up to the maximum rating of each output while still maintaining full agency approvals.

Other power supplies only permit predefined output voltages in order to maintain the approvals status.

The RCL175 is available with one to four outputs: 3 to 60V on output one, 5 to 60V on output two, and 5 to 30V on outputs three and four.

Outputs three and four are isolated, allowing parallel or series connection for further flexibility.

Output one is user-adjustable by +/-10% and the other outputs track this by the same percentage.

The number of output configurations is therefore infinite, as is the variety of applications for this unit.

The compact power supply is approved for industrial, IT and medical applications and is suited to both Class I and Class II use (with or without a mains earth connection).

The RCL175 is rated at up to 120W with convection cooling, 175W with 340 litre/min of forced-air cooling, and has a peak rating of 200W.

Efficiencies range from 84 to 90%, depending on output configuration.

The range is based on 18 standard models that can be quickly modified, both electrically and mechanically, for individual applications.

Mechanical options include open frame, U-channel, U-channel with cover and U-channel with fan cover.

Molex or terminal block connectors can be provided.

Open frame models measure just 140 x 94.1 x 32.6mm and weigh 500g.

The RCL175 uses a silicon carbide diode to maximise efficiency and minimise component count in the power-factor-correction boost convertor.

Fractional turn technology in the transformer also enhances efficiency and further reduces component count, allowing combinations of outputs such as 3.3 and 5V without the need for postregulation.

The topology facilitates the use of low voltage Schottky rectifiers in the output stages, eliminating the need for more complex rectification arrangements, while maintaining high efficiency.