International Rectifier (IR, El Segundo, CA) announced a new series of integrated switchers that combine a HEXFET power MOSFET with a controller IC in a single package. The IRIS Series of integrated switchers are claimed to decrease the component count by 25 percent, with same or better efficiency than discrete-based circuits in ac/dc applications.
The new devices are optimized for flyback topologies in universal- and single-input, 60W to 180W, switch-mode power supply applications. The IRIS Series operates 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. The 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.
"The IRIS Series devices will simplify power system design, and will allow product engineers to concentrate on the design-critical features, functions and performance capabilities of their end-products," said Stephen Oliver, marketing manager for ac/dc products at IR.
Engineering samples of the IRIS Series are currently available, with volume production scheduled for August 2001. Pricing begins at $1.14 each in 1,000-unit quantities.
