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Power MOSFETs promises 30% part count reduction

Posted: 21 Dec 2005     Print Version  Bookmark and Share

Keywords:International Rectifier  IR  HEXFET  power MOSFET  IRFB3077PbF 

International Rectifier (IR) introduced very high efficiency 75V and 100V HEXFET power MOSFETs in the TO-220 package that promise to deliver a part count reduction of 30 per cent or more in secondary synchronous rectification, full-bridge topology power supplies compared to competing devices in the same package.

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

"As the demand for ever-faster data processing continues to increase, information processing systems demand more power. In spite of this, system form factors must remain the same or even shrink. The 75V and 100V TO-220 HEXFET MOSFETs allow more power management to fit in the same amount of space, and have the lowest device on-resistance among competing MOSFETs," said Stephen Oliver, marketing manager for SMPS products at IR.

The IRFB3077PbF is a 75V MOSFET with 3.3 mΩ maximum device on-resistance, and enables a 30 per cent parts count reduction (from ten TO-220 devices to seven TO-220 devices), with a reduced PCB area and heat-sinking for higher power density in 3kW server SMPS with 12V output.

The IRFB4110PbF is a 100V MOSFET with 4 mΩ maximum device on-resistance, and can slash component count in half, reducing PCB area and reducing heatsink size, added IR.

Pricing for the IRFB4110PbF (100V) is Rs.104.53 ($2.28) each, while the IRFB3077PbF (75V) is priced at Rs.91.24 ($1.99) each, both in 10,000-unit quantity. The synchronous HEXFET MOSFETs are Pb-free and RoHS-compliant.

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