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ST reduces on-resistance for fast-recovery MOSFETs

Posted: 09 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:fast-recovery MOSFETs? N-channel MOSFET? capacitance?


STMicroelectronics has rolled out a new family of fast-recovery MOSFETs that combine enhanced switching performance with on-resistance improved by more than 18 percent over existing devices, to meet the needs of efficiency-focused applications, including renewable-energy controllers.

The first device in the new Super-Junction FDmesh II family is the STW55NM60ND, a 600V N-channel MOSFET offering the industry's best on-resistance of 0.06 for fast-recovery MOSFETs in the standard TO-247 package. The peak drain current of 51A allows one MOSFET to replace multiple components in converters for space-constrained applications such as telecom and server systems. Combined with savings in thermal management due to reduced losses, this allows designers to significantly increase power density.

To deliver these performance enhancements, ST has improved its FDmesh super-junction architecture by combining a vertical structure with the conventional strip MOSFET, which also features a faster and more rugged intrinsic body diode. In addition to reducing on-resistance and recovery time, further improvements increase switching efficiency and save driving losses by reducing gate capacitance, gate charge and gate input resistance. The devices also have high dv/dt rating for higher reliability during switching, particularly in bridge-type topologies including Zero Voltage Switching (ZVS) under light-load conditions.

Future devices to be introduced using this architecture will provide additional package options and current ratings, combined with the industry's best on-resistance for fast-recovery MOSFETs in each respective package. These include the STP30NM60ND, rated to 25A drain current and achieving 0.13 on-resistance in the TO-220 package. The STD11NM60ND for applications up to 10A has 0.45 on-resistance in the surface-mount DPAK package. ST will progressively introduce additional devices in the FDmesh II series, providing an extensive range of voltage and current ratings in industry-standard power packages.

The STW55NM60ND is now available in production volumes at $10 in quantities of 1,000 units and higher.

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