Product category: Discrete Power Devices
News Release from: International Rectifier | Subject: IRFB42N20D and IRF3703
Edited by the Electronicstalk Editorial Team on 19 March 2001
MOSFETs improve power
density on both sides
New from International Rectifier are two TO-220-packaged HEXFET power MOSFETs that maximise power density and performance in primary- and secondary-side DC/DC convertor circuits
Related stories
QPL rectifiers target high-reliability supplies
High-reliability Schottky rectifiers are manufactured in accordance to the Defense Supply Center Columbus Qualified Products List
MOSFET chipset raises bar on efficiency
Chipset powers high-current DC/DC convertors used in advanced telecomms and datacomms systems, notebook, high-end desktops and servers
New from International Rectifier are two TO-220-packaged HEXFET power mosfets that maximise power density and deliver maximum performance in primary- and secondary-side DC/DC convertor circuits. Suitable as replacements for larger TO-247-packaged devices, the new mosfets are specifically designed for high-efficiency, 48V-input isolated DC/DC convertors for telecomms and datacomms systems.
The IRFB42N20D is optimised for primary-side circuits, while the IRF3703 is tuned for secondary-side, sub-3.3V output applications.
The IRFB42N20D is a 200V mosfet with a low gate charge (QG) of 103nC.
The gate charge reduces switching losses so significantly that it out-performs similar mosfets in the larger TO-247 package.
Further reading
Power chipset enables N+1 redundancy
A new chipset for scalable multi-phase, interleaved buck DC-DC convertors adds N+1 redundancy, hot-swapping capability and several protection features
Reference designs for power chipsets
Two new POWIR+ chipset reference designs are for high-end consumer applications and computing
For example, the new IRFB42N20D replaced a competing TO-247 device in a 48V input, 5V output resistor-capacitor-diode (RCD) clamp-forward converter operating at 110kHz.
At full load (40A), the IR device in the TO-220 package delivered better than 1% efficiency improvement over the competing solution in the larger TO-247 package.
The 1%-plus efficiency increase using the new primary-side mosfet is significant since it is achieved in a smaller package.
With increasing power density requirements driving circuit designers to use higher operating frequencies, the low gate charge of the IRFB42N20D is the key enabling factor for faster switching speeds and more efficiency in a smaller package.
High efficiency, low-voltage DC/DC convertors use mosfets instead of Schottky diodes in the secondary circuits.
For sub-3.3V output applications, the IRF3703 has optimised characteristics that improve efficiency in secondary-side synchronous rectification circuits.
The IRF3703 is the best performing 30V mosfet in a TO-220 package, with 2.8mohm device on-resistance, or RDS(on).
This is 20% lower than the nearest competing device.
The IRF3703 RDS(on) performance reduces conduction losses, while the low gate impedance reduces switching and driver losses.
In multiple-output, isolated convertors, circuit board layout is often simplified if the same device can be used in the secondary stages.
The IRF3703 is an excellent choice for secondary stage applications, and reduces bill of material line items as well as time to market.
• International Rectifier: contact details and other news
• Email this news to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Related Business News
Trusted Resource for the Working RF Engineer
[Components] Broadband YIGs Yield Fundamental Tones To 20 GHz To switch or not to switch? These lines of YIG-tuned sources offer low-phase-noise coverage of 2 to 20 GHz continuously and by switching between two frequency bands.
Board: Druggists Must Fill Prescriptions
Druggists who believe 'morning-after' birth control pills are tantamount to abortion can't stand in the way of a patient's right to the drugs, state regulators have decided.
Sec Aide: Risk In Credit-default Swaps
The Securities and Exchange Commission is raising the possibility that an increasingly popular type of financial instrument may be used to engage in insider trading -- but there may be questions about the SEC's jurisdiction over the products.
Company Profile for Intelligentz Corporation
Intelligentz provides not only a cutting edge RFID solution, but the software to make it work. Dedication makes us strive to exceed all of your expectations.
Tcdi(r) Announces Staff Additions
Tcdiâ® , a market leader in Litigation Technology, today announces the addition of five new employees.
Search the Pro-Talk network of sites
