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Rohm develops high-efficiency H-bridge drivers

Posted: 29 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:H-bridge? drivers? commutated motors? Rohm? LSI?

H-bridge driver LSIs from Rohm

Rohm Co. Ltd has announced the development of 33 series of H-bridge driver LSIs for brush-commutated motors. These devices feature low power consumption for high-efficiency motor driving and are suited for a wide variety of applications, including audiovisual equipment, PC peripheral devices, office automation equipment and home electrical appliances.

VREF variable system
Brush-commutated motors are used in a wide range of applications and the number of applications is continually increasing. Changing the product design through modification of motor specifications or control functions is often time consuming and imposes a heavy burden during the development stage. Rohm's H-bridge driver LSI series incorporates a new VREF variable system for driving brush-commutated motors with low power consumption without changing the input voltage level. This simplifies replacement while providing optimum motor drive operation with minimal design changes, the company said.

The new devices support a wide range of supply voltage (3-36V) and output current (up to 2A). They also achieve lowering circuit current under no load down to 1/10~1/20 compared to conventional LSIs. Moreover, a power-saving circuit is integrated to suppress standby current. This contributes to energy-efficient circuit design.

Energy-saving LSIs
The BD6221F H-bridge driver series for brush-commutated motors is available in a variety of voltage ratings, current and packages. Rohm will continue to use its proprietary power management technology to develop the efficient, energy-saving LSIs that meet or exceed the demanding customer requirements in a variety of applications, such as industrial equipment and consumer appliances.

Mass production of the BD6221F was implemented in October 2006 in response to increasing demand for AV equipment and PC peripheral devices. High-volume production of other models will follow. The company is currently setting up a system that will drive a production output of one million units per month. Rohm Hamamatsu Co. Ltd is in charge of the primary stage of production while Rohm Integrated Systems Co. Ltd in Thailand is responsible for the second phase.

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