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Fairchild MOSFETs enable ultraslim, ballast apps

Posted: 05 Sep 2006     Print Version  Bookmark and Share

Keywords:Fairchild  SuperFET  MOSFETs  DPAK 

Fairchild Semiconductor recently developed a family of low on-resistance 600V SuperFET MOSFETs specifically to address the DPAK (TO-252) device requirements of the latest ultra-slim, low-profile ballast applications. To minimize switching and conduction losses and meet system efficiency needs of these fast-switching lighting designs, Fairchild said its DPAK SuperFETs offer down to one-third the on-resistance (0.6-1.2 ohms) of traditional planar MOSFETs. They also have the ability to withstand both high-speed voltage (dv/dt)- and current (di/dt)-switching transients necessary for ballasts to operate reliably at very high frequencies, the company said.

Typically, as the breakdown voltage of a standard MOSFET rises, its Rds(on) also goes up exponentially and leads to increased die size. Fairchild's proprietary SuperFET technology changes this Rds(on)-to-die size relationship from an exponential to a linear one. This approach allows SuperFET devices to achieve a very impressive Rds(on) and small die size, according to the company, even at a 600V breakdown voltage. Fairchild's SuperFET in DPAK is the latest evolution of this packaging innovation.

"We've added DPAK devices to our SuperFET product portfolio specifically to meet the energy efficiency and the space-reduction demands of lighting manufacturers," said Taehoon Kim, VP of Fairchild Semiconductor's functional power group. "Our proprietary SuperFET technology results in the extremely low on-resistance needed to decrease MOSFET die-size and make 600V/0.6 ohm DPAK-packaged product possible. In comparison, typical 600V/0.6 ohm planar MOSFET devices for lighting applications come in larger TO-220- or D2PAK packages."

SuperFET MOSFETs are available in a Pb-free DPAK package that meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020C and is compliant with European Union regulations now in effect. Pricing for the device is as follows: FCD7N60 (Rds(on) of 0.6 ohm max), Rs.71.52 ($1.54); FCD5N60 (Rds(on) of 0.95 ohm max), Rs.58.51 ($1.26); and, FCD4N60 (Rds(on) of 1.2 ohms max), Rs.52.94 ($1.14). These products are already available.

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