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Smart power modules drive two-phase SRM

Posted: 25 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:smart power module? two-phase SRMs? small motors?


Fairchild Semiconductor Corp. has introduced two smart power modules (SPM) for driving two-phase switched reluctance motors (SRM) in small motor applications such as vacuum cleaners. SRMs are an attractive alternative to AC drives due to their high efficiency. The small motor industry is migrating from single-phase to two-phase SRM motors due to their ability to startup under difficult load conditions and the lower components that these motors require.

Two SRM-SPM modules are available: Both the FCAS20DN60BB and FCAS30DN60BB integrate two high-voltage ICs (HVIC), one low-voltage IC (LVIC), four NPT IGBTs, four fast recovery diodes (FRDs), two bootstrap diodes, a thermistor and various protection functions in a single package. By integrating 14 fully tested power components in a compact 45mm x 28mm SIP package, these products offer 40 percent space savings. This space conservation allows vacuum cleaner designers to incorporate the controller into the SRM assembly, and also improves design productivity and manufacturability. System reliability is further enhanced by incorporating protection features such as under-voltage lockout and short circuit protection into this thermally efficient package.

The RoHS-compliant FCAS20DN60BB and FCAS30DN60BB utilize Pb-free terminals and have been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020.

At volumes of 100 pieces, the FCAS20DN60BB (600V/20A) is priced at $16.38,and the FCAS30DN60BB (600V/30A) is at $17.94. Samples are available.

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