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Fast-recovery rectifier keeps EMI quiet

Posted: 24 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:rectifier? diodes?

Fairchild Semiconductor has announced seven new STEALTH II fast-recovery rectifier diodes. rectifiers feature fast reverse recovery and soft recovery characteristics that enable reduced MOSFET switching losses and EMI in continuous-current-mode (CCM) power factor correction (PFC) designs. Alternate solutions provide snappy reverse recovery, but this is at the expense of EMI characteristics. Fairchild's STEALTH II rectifiers feature a low stored charge and soft recovery that minimize ringing and electrical noise in the power switching circuit, which, in turn, reduces overall EMI. When using Fairchild's STEALTH II rectifiers, there is no need to use a snubber circuit, and the size of the EMI filter is reducedmaking the overall solution more efficient, compact and less expensive.

Other advantages of the STEALTH II diodes include energy efficiency through high speed switching (FFP15S60S: trr Max <35ns @ IF = 15A) and low forward voltage drop (Vf<2.6V);

System reliability attained by soft recovery characteristics ( FFP15S60S: tb/ta>0.9); and

Space-savings resulting from elimination of the snubber circuit and reduced EMI filter size.

Improving the efficiency and the power factor of a power supply is a significant design challenge in the industry. Since today's electronics require a power supply to operate, every aspect of a power supply's design that offers more efficiency can have a positive impact on the environment and far-ranging green ramifications. Fairchild Semiconductor's products are integral to optimizing system power. Fairchild's complete portfolio of products for AC/DC switch mode power supplies reduce energy consumption and minimize our global environmental footprint. From discrete components such as diodes and MOSFETs to Green Fairchild Power Switches, Fairchild's solutions achieve increased efficiency, reduced standby power and support global green initiatives.

As with all of Fairchild's products, these STEALTH II rectifiers utilize a lead-free (Pb-free) finish and are designed to fully meet the requirements of the European Union's Directive on RoHS.

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