Synchronous Rectification MOSFETs Shrink Part Count

Jan 25, 2006 3:38 PM

International Rectifier has introduced high-efficiency 75-V and 100-V HEXFET power MOSFETs in the TO-220 package. These devices enable a part count reduction of 30% or more in secondary synchronous rectification, full-bridge topology power supplies compared to competing devices in the same package.

The new 75-V MOSFETs are designed to shrink circuit size and increase power density in high power server ac-dc switch-mode power supplies (SMPS) with 12-V output or in 48-V rail ORing circuits. The new 100-V devices suit high-power flyback secondary rectification or offer enhanced primary-side efficiency in high power telecom isolated 48-V dc-dc converters. In addition, the new MOSFETs can be used in stepper motor and brushless dc motor drive applications.

The IRFB3077PbF is a 75-V MOSFET with 3.3-mΩ maximum device on-resistance, and enables a 30% parts count reduction (from 10 TO-220 devices to seven TO-220 devices), with a reduced pc board area and heatsinking for higher power density in 3-kW server SMPS with 12-V output. The gate charge is maximum 220 nC for this part.

The IRFB4110PbF is a 100-V MOSFET with 4.0-mΩ maximum device on-resistance, and can slash component count in half, reducing pc board area and reducing heatsink size. It also features a maximum gate charge of 210 nC.

Available now, pricing for the IRFB4110PbF is $2.28 each, while the IRFB3077PbF is $1.99 each, both in 10,000-unit quantities.

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