EL SEGUNDO, Calif. June 2003 - International Rectifier, IR® (NYSE: IRF), introduces a new chip set for the analog stage of IR's iMOTION™ integrated design platform for Motor Control. The chip set consists of the new IR2175 linear current-sensing IC and the existing IR2136 three-phase inverter-driver IC. The IR2175 provides current feedback information and features a fast frequency output (F_O = 130kHz) for higher bandwidth and faster acceleration, needed for demanding servo motor applications such as high speed printing, packaging and machine tools, as well as automation including robotics and positioning stages.

The analog stage chip set is the "bridge" between the IRMCO201 and IRMCO203 digital control engine and the power stage in the iMOTION integrated design platform. The new IR2175 is designed for 230V three-phase AC or brushless DC industrial drive applications. In addition, the IR2175 features built-in current sensing and protection circuits. Motor drive circuits using the IR2175 eliminate external opto- or Hall-effect sensors, reducing circuit size, simplifying design and increasing reliability.

David Tam, Vice President, Consumer and Industrial Sector Business said, "As a member of the iMOTION platform, the IR2175 simplifies the way analog Motor Control circuits handle current sensing and motor protection circuits."

Technical Highlights
The IR2175 has a 2.0 microsecond over-current shutdown feature with a wired-OR connection to communicate directly to the microprocessor or DSP. Conventional linear current-sensing opto- or Hall-effect-based systems have typical shutdown times of three to four microseconds, and require two external comparators and a level-shift operational amplifier to achieve the same function. In addition, as opto-couplers age, the current transfer ratio (CTR) between the LED and receiving device degrades, causing system failure. By eliminating opto-couplers, the IR2175 retains high performance over time, increasing reliability. The new device uses PWM output and runs off a bootstrap supply instead of a dedicated secondary supply to reduce size and parts count. The new IR2175 comes in two industry-standard, compact package outlines: SO-8 and 8-pin DIP.

The IR2136 devices are made with three high-side MOSFETs and three low-side IGBT high voltage gate drivers with a range of protection functions, and are CMOS- or LSTTL-output compatible, to 3.3V logic for direct interface with a microcontroller or other logic devices and offer 120mA/250mA output source/sink current. The IR2136 inverter/driver ICs enable robust designs with up to 50V/ns dV/dt immunity and low di/dt drive current for noise immunity.

The IR2136 has a deadtime as low as 250ns, and a typical turn-on/turn-off time of 400ns, to match the IR2175. The output drivers feature a high pulse current buffer stage for minimum driver cross-conduction, and includes cross-conduction prevention logic to eliminate short-circuit conditions. Matched propagation delays for all six channels in the single IC package ensure consistent high frequency operation. An over-current function terminates all six outputs. An open-drain fault signal to the main controller indicates that an over-current or under-voltage shutdown has occurred. The IR2136 devices are packaged in 28-lead DIP, 44-lead PLCC or 28-lead SOIC packages.

Availability and Pricing
The new IR2175 and the IR2136 are available immediately. Pricing is US $2.50 each in 10,000-unit quantities for the IR2175, and US $3.40 each for the IR2136 in 10,000-unit quantities.

About iMOTION™
International Rectifier's iMOTION™ integrated design platform comprises a development system and mixed-signal chip set, which when co-designed together simplify Motor Control designs and bring energy-efficient, cost-effective solutions to market faster.

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