Power Electronics

Data Points

IR Introduces Automotive Motor Controller IC

El Segundo, Calif.-based International Rectifier (IR) has introduced a new highly integrated IR3220S H-bridge motor controller IC for automotive dc applications up to 6 A. The extensive functionality of the IR3220S cuts component count by as much as 90% compared to discrete designs, reducing design time and cost by up to 20%. It enables rugged designs with benchmark electrical characteristics.

Rated at 40 V, the IR3220S integrates an H-bridge controller with two very efficient high-side HEXFET MOSFETs in a single 20-pin package. A complete, fully operational and fully protected H-bridge control actuator with forward, reverse, braking and non-braking modes without a microcontroller can be made with the IR3220, two IRF7484 low-side MOSFETs and 10 external passive components. The H-bridge circuit occupies 21 mm × 25 mm, or less than one square inch, as much as 80% smaller than an H-bridge circuit using discrete devices.

The IR3220S has been designed to drive motors and actuators in automotive applications such as fuel, water and vacuum pumps, compressors, throttle controls, power seats and door locks, window lifters, automatic sunroofs, and windshield wipers.

Shoot-through, overtemperature and overcurrent protection, overvoltage clamp and undervoltage lockout for both high- and low-side are built-in to enable a rugged H-bridge design. The innovative shoot-through design controls each leg of the H-bridge independently and eliminates diagonal commands. The IR3220S also integrates a programmable soft-start sequence using an internal 20-kHz PWM to limit in-rush currents.

For more information, visit auto.irf.com.

Motor Drive Module Includes Control

Combining six power MOSFETs with control circuitry in a single direct bonded copper (DBC) assembly, BI Technologies, a subsidiary of TT electronics Co., has developed a motor drive module for 3-phase brushless motors. In fact, the control circuit employs Motorola's MC33035 motor controller chip and incorporates FET driver ICs. The assembly is mounted with a special designed adapter plate that enables the unit to achieve optimum heat dissipation while maintaining a profile of just 0.490 in. According to the manufacturer, this integrated design saves space, reduces weight and improves motor performance.

It operates from 18 Vdc to 50 Vdc and provides 30 A of continuous current (50-A peak) to drive 3-phase brushless motors. For fast response to overloads, the assembly includes a temperature sense thermistor and a current sense resistor. It measures 3.5 in. × 2.22 in. × 0.490 in., and is rated to operate over a temperature range of -40°C to 85°C.

For more information, visit www.bitechnologies.com/products/microcircuits.html.

100-V Forward with Active Clamp PWM Controller

The LM5025 100-V pulse-width modulation (PWM) forward dc-dc controller from National Semiconductor Corp., Santa Clara, Calif., employs the active clamp/reset technique for use in communications, automotive, distributed and industrial power systems, as well as multi-output power supplies.

Designed for high-speed capability and integrating a user-programmable oscillator with a frequency range up to 1 MHz and total propagation delays of less than 100 ns, the LM5025 provides higher efficiencies and greater power densities than current communication systems power converters.

The LM5025 integrates a 100-V start-up bias regulator, uniquely qualifying the device for an array of -48-V communication isolated power-upply applications. With the active clamp output, it can be configured to guarantee either overlap time (for p-channel switch applications) or dead-off time (for n-channel applications).

For more information, visit www.national.com.

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