Fan motor driver with integrated Hall sensor and digital AGC

11 December 2012

ROHM announced the development of the BU6904GF/NUX and BU6906GF/NUX fan motor drivers with built-in Hall element.

These new drivers are the first to include a digital AGC (Automatic Gain Control) function that contribute to not only greater miniaturisation and lower power consumption, but reduced drive noise for silent operation.

The increasing complexity and speeds of electronic devices increase the demand and applicability of cooling fan motor drivers. However, due to motor characteristics such as signal detection accuracy it has become commonplace up to now to utilise a discrete 2-chip configuration consisting of a separate Hall IC and motor driver. But the trend towards decreased size and greater miniaturisation requires smaller, thinner components and fewer external parts, making it necessary to develop a driver IC that integrates a Hall element.

In response, ROHM utilised CMOS processes and original circuit technology to minimize the chip size. In addition, the drivers, which incorporate a Hall element that eliminates the need for a separate Hall device, are equivalent in size and thickness with conventional Hall ICs, reducing mounting area considerably. An digital AGC function is included – an industry first, along with linear Hall signal detection combined with PWM soft switching drive minimises Hall signal waveform fluctuations for improved circuit efficiency and noise characteristics.

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