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SR controller packs MOT protection circuitry

Posted: 09 Dec 2009     Print Version  Bookmark and Share

Keywords:SR controller  power converter  switch mode  MOSFET 

IR11672A SmartRectifier IC

From International Rectifier comes the IR11672A SmartRectifier IC with advanced Minimum On Time (MOT) protection circuitry for energy-efficient AC/DC power converters for laptops, LCD and PDP TVs, game consoles, and server and telecom Switch Mode Power Supplies (SMPS).

Featuring IR's proprietary 200V IC technology, the IR11672A is a smart secondary-side synchronous rectification (SR) controller designed to drive n-channel power MOSFETs used as synchronous rectifiers in isolated flyback and resonant half-bridge converters. As a result of the device's MOT protection circuitry, reverse current is prevented at very light load or no load conditions in both flyback and resonant half-bridge converters, while power shutdown spikes that cause avalanche breakdown in resonant half-bridge converters are minimised during power off for highly reliable operation.

"The IR11672A SmartRectifier's advanced MOT protection circuit offers a high level of accuracy and reliability in a variety of transformer switching modes and applications that require optimum system efficiency and power density in a compact design. Moreover, because the device operates in lower power burst mode, it enables compliance with '0.3W Standby', California Energy Commission (CEC) and Energy Star standards," said Tom Ribarich, director, IR's energy saving products business unit.

The IR11672A accurately determines turn-on and turn-off based on MOSFET drain sensing voltage in close proximity to zero current transition, eliminating the need for additional components including heat sink to simplify design. Ruggedness and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression to allow reliable operation in fixed and variable frequency applications.

Other key features include maximum 500kHz switching frequency, enable pin, anti-bounce logic and UVLO protection, 7A peak turn-off gate drive current, micro power start-up and ultra low quiescent current. The IR11672A also features 10.7V gate drive clamp, 50ns turn-off propagation delay and a wide Vcc operating range from 11.3V to 20V. The device is offered Pb-free and is RoHS-compliant.

IRAC1167-D1, IRAC1167-D2, IRAC1167-D3 daughter cards are available which offer a fast and simple way to compare efficiency and simplicity of IR's SmartRectifier solution versus diode designs and complex SR solutions.

Pricing for the IR11672A begins at Rs.43.00 ($0.92) each in quantities of 10,000-units. Production quantities are available immediately. The device is lead free and RoHS-compliant. Prices are subject to change.

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