Single coil fan and pump driver has low noise for home appliances

Suitable for use in industrial and home appliances, the MLX90412 is a 35W low noise single coil fan and pump driver for industrial and home appliance applications.

Melexis has introduced the MLX90412, which has peak driving capability of 2.2A. It is claimed to combine high performance with low noise operation. It operates from 3.5 to 32V supply and is robust up to 40V. It is therefore suitable for use in equipment on 12V and 24V power supplies, as well as for portable applications with up to seven Li-ion cells (around 29V). It is suitable for use as drain pumps for washing machines and dish washers, as well as toilet pumps, fans, blowers and cross blowers in air conditioning units, desk fans and pedestal fans and Li-ion based applications including robot cleaners and robot lawn mowers.

Multiple motor commutation options can be accommodated to meet the need for high torque and low acoustic noise, as well as low vibration. A patented adaptive control algorithm ensures the highest efficiency is achieved with the lowest reverse current, over the full speed range and independent of the motor inductance or applied lead angle.

Both open loop and closed loop speed control are possible, with a range of dynamic (PI) settings, for a speed range up to 45,000 e-rpm (electrical RPM). The closed loop speed control allows the speed tolerance to be reduced to as low as ± three per cent. In combination with the low acoustic noise current shaping, Melexis believes the MLX90412 offers “unprecedented noise performance in this price segment”, making it a cost-effective alternative to expensive three-phase device in challenging applications. In pump applications, the closed loop can also be used as no-load or run-dry protection, to help avoid running pumps at excessive speeds, preventing high audible noise, and early failure.

The integrated protection features include locked rotor, over-temperature, over-voltage, short circuit and current limiting, as well as built-in supply clamping. The MLX90412 is programmable via an I2C interface and all options are configurable in the on-board EEPROM.

The MLX90412 is available in a 3.0 x 3.0mm DFN10 package.

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