Product category:
Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: IRIS Series
Edited by the Electronicstalk Editorial
Team on 08 August 2001
MOSFET and controller combine for tiny
switchers
International Rectifier has introduced a series of efficient, low-cost and rugged integrated switchers, which combine a HEXFET power MOSFET with the controller IC in a single package.
International Rectifier has introduced a series of efficient, low-cost and rugged integrated switchers, which combine a HEXFET power mosfet with the controller IC in a single package The IRIS-Series integrated switchers simplify design and reduce PCB area and component count by 25% at the same or better efficiency than discrete-based circuits in AC/DC switched mode power supplies
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
Related stories
1kV rad-hard power MOSFET saves satellite space
International Rectifier has introduced the world's first 1000V radiation-hardened power MOSFET.
MOSFETs improve 12V-input converter efficiency
Two new 20V HEXFET power MOSFET families from International Rectifier are designed to increase efficiency by up to 4% in 12V-input DC/DC convertors.
The new devices are optimised for flyback topologies in universal- and single-input, 60 to 180W SMPS.
The IRIS Series devices are designed to simplify design, decrease cost, and reduce size and weight in high-volume consumer applications.
Shrinking power conversion circuits increases designers' options for sleeker, streamlined products such as monitors, DVD players, fax machines, printers and set-top boxes.
Further reading
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.
Rad-hard MOSFETs protect and survive
With high radiation hardness and unparalleled single event effect (SEE) immunity, International Rectifier's new R5 MOSFETs are well suited for systems that must survive penetrating gamma rays.
Reference design simplifies high-efficiency PSUs
International Rectifier has released a reference design for its recently introduced IR1176 application-specific synchronous rectification IC (SRIC).
By combining the mosfet and the controller IC into a single package, the circuit stray inductance due to the PCB and the discrete packages is reduced, which results in lower switching losses at higher PWM frequencies.
In-circuit testing demonstrates that IRIS Series integrated switchers improve efficiency by up to 1.5% compared with a discrete solution with equivalent mosfet ratings and up to 4.5% compared with competitive devices with equivalent ratings.
International Rectifier uses a patent-pending film die attach technology using superior insulated material that further reduces the stray inductance of the integrated switcher package and allows to use a bigger mosfet die in the same package, resulting in higher efficiency and higher power levels.
International Rectifier's novel film die attach technology also reduces device assembly steps which makes SMPS built with these devices cost-competitive with discrete solutions.
This new technology has been extensively tested through temperature life tests and exceeds industry standard requirements.
The IRIS Series integrated switchers can operate in either a quasi-resonant or pulse ratio control (PRC) mode.
In quasi-resonant mode, switching is done when the drain voltage is at the lowest point of oscillation to reduce switching losses, which increases the overall efficiency at high load conditions.
PRC mode is preferred when a low-current standby mode may be required.
The operation of the device can be made to switch between PRC and quasi-resonant modes to achieve higher efficiency and reduced switching losses.
To allow design flexibility and ruggedness, the new IRIS Series devices include overvoltage protection as well as overtemperature and variable overcurrent protection.
In addition, the IRIS Series devices include a rugged, fully characterised avalanche energy HEXFET power mosfet.
"IRIS Series integrated switchers are the ideal solution for designers that look for a simple, cost effective and efficient solution for the power stage of his circuit", said Stephen Oliver, Marketing Manager for AC/DC Products at International Rectifier.
"Selecting an IRIS Series device will allow the designer to significantly reduce the size of the power stage with little design effort and without any compromise in performance so that he can focus on the design critical factors outside of the power stage", Oliver concluded.
Fully tested and documented AC/DC flyback convertor reference designs, including PCB layouts, are available for the new IRIS devices.
An application note is included to assist transformer design and the reference design is available.
• International Rectifier: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
