Versatile Op Amps Need No Resistors


Posted on Feb 6, 2014

One of the many problems besetting the power supply designer today is being able to design a switching power supply that is able to operate in all the power systems within their international marketplaces. Forward ’mode switching power supplies typically operate over a single power system`s range of voltage, that is, 90 to 130 VAC or 200 to 270 V


Versatile Op Amps Need No Resistors
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AC. Boost ’mode converters CAN just make the range of 90 to 270 VAC. Any higher input voltages would then require a different design. This leads companies to create products targeted at specific marketplaces, which CAN be costly, or to have their customers arrange jumpers to accommodate their power system which CAN be annoying or lead to costly errors. Added to this are those industrial companies which may not only have their products reside on residential power systems but also have the varied international industrial power systems. This means that a single product family might have to operate from an input voltage of 90 to 600 VAC, well beyond the residential limits of 90 to 270 VAC. This paper reviews one method of enabling a discontinuous ’mode flyback converter to operate beyond its traditional range of input voltage of 3:1 to a range of more than 6. 6:1 without affecting the reliability of its operation. This is done by changing its mode of operation and the use of recently available Power MOSFETs with breakdown voltage ratings of 1, 200 V.




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