In contrast to traditional current transformer SR methods, the IR1168 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 to simplify design.
“While synchronous rectification provides significant energy savings compared to diode-based designs, traditional SR methods are complex and require a high component count. Using only two gate resistors and a supply capacitor, the IR1168 delivers a lower system temperature and increased power density for even greater efficiency and reliability than existing SR methods while simplifying design and drastically reducing component count to shrink PCB size,” said Tom Ribarich, director, International Rectifier’s Energy Saving Products Business Unit.
Co-designed with International Rectifier’s DirectFET MOSFETs, which feature company’s new Trench silicon and packaging technology, the IR1168-based solution delivers an efficiency improvement of 1.5% for a standard 240W LCD TV SMPS and a reduction of rectifier device temperature of 25°C while shrinking board size by two thirds.
The IR1168, featuring International Rectifier’s high-voltage IC technology, supports burst mode operation to deliver efficiency benefits even at light loads. Ruggedness and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression that allows reliable operation in fixed and variable frequency applications. Other key features include maximum 500 kHz switching frequency, anti-bounce logic and UVLO protection, 4A peak turn-off gate drive current, micropower start-up and ultra low quiescent current, 10.7V gate drive clamp, 70ns turn-off propagation delay and a wide Vcc operating range from 8.6V to 18V.
Availability and Pricing:
Available in an 8-pin SOIC package, pricing for the IR1168SPbF begins at $1.50 each in quantities of 10,000-units. Production quantities are available immediately. The devices are lead free and restriction of hazardous substance (RoHS) compliant.
