Adaptive control algorithm ensures best-in-class acoustic and torque performance
Melexis introduces a new high speed fan controller IC. coil single pump and 2,2A peak drive. The MLX90412 combines high performance with low noise operation, making it ideal for a wide range of home appliance and industrial applications. Suitable for driving loads up to 35W, it complements the previously released MLX90411, adding a high power option to the range. The MLX90412 operates with a supply voltage in the range of 3,5 V to 32 V, and is robust up to 40 V. This makes it highly suitable for use in equipment with 12 V and 24 V power supplies, as well as for portable applications with up to seven Li-ion cells (~29 V).
Appliance applications include drain pumps for washing machines and dishwashers, as well as toilet pumps; fans, centrifugal and cross fans in air conditioning units, tabletop fans and pedestal fans; and Li-ion based applications, including robot cleaners and robot lawn mowers. Multiple motor switching 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 that the highest efficiency is achieved with the lowest reverse current, over the entire speed range and regardless of motor inductance or applied lead angle.
Both open-loop and closed-loop speed control is possible, with a wide range of dynamic (PI) settings, for a speed range up to 45.000 e-rpm (electrical RPM). Closed loop speed control allows speed tolerance to be reduced to a minimum of +/- 3%. Combined with low acoustic noise current shaping, the MLX90412 offers unprecedented noise performance in this price segment, making it a cost-effective alternative to the expensive three-phase solution in many more challenging applications.
In addition, in pumping applications, the closed loop can also be used as vacuum or dry protection, to help prevent pumps from running at excessive speeds, preventing high noise and early failure. The MLX90412 has multiple built-in protection features including locked-rotor, over-temperature, over-voltage, short circuit and current limiting, as well as on-board power supply clamping. Like the MLX90411, the MLX90412 is programmable via an I2C interface and all options are configurable on the onboard EEPROM. The MLX90412 is available in a 3mm x 3mm DFN10 package.
