Now control motor speed of DC Fan by ROHM’s DC/DC Converter

Integrated design reduces mounting area by 75% over discrete configurations

ROHM has recently announced the availability of a buck DC/DC converter optimized for DC fan motor power supplies used in applications such as cold air circulation in refrigerators.

Until now, however, DC fan motor power supply blocks used in refrigerators and other equipment are primarily configured using discrete components, making it difficult to provide high accuracy control or carry out high frequency drive. As a result larger coils and output capacitors are required for the peripheral circuit, increasing mounting area considerably, which can be problematic.

The BD9227F is the industry’s first power supply IC capable of controlling the rotational speed of DC fan motors with high accuracy by linearly varying the output voltage based on the PWM duty signal generated by the MCU. In addition to more accurate control vs conventional discrete configurations, ROHM leverages proprietary IC analog circuit design technology to achieve circuit optimization along with high frequency (1MHz) drive. This supports the use of smaller peripheral components (i.e. coil, output capacitor), reducing footprint by 75% while improving power conversion efficiency by 19% (at 300mA output), contributing to greater accuracy, increased miniaturization, and higher power conversion efficiency in DC fan motor applications.

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