Dedicated fan motor drivers simplify appliance design

September 29, 2016 // By Graham Prophet
These software-less motor drivers improve motor system efficiency and reduce acoustic noise through 180° sinusoidal driving. From ON Semiconductor, three devices are configured for driving 3- phase BLDC motors via 180 degree sinusoidal waveforms.

Designed for use in cooling fans of household appliances such as refrigerators, as well as games consoles and computing equipment, the LV8811, LV8813, and LV8814 have voltage ranges of 3.6 volts (V) to 16 V, 6 to 16 V, and 3.6 to 16 V respectively. As well as giving software-free designs, they reduce acoustic noise and vibration, and enable deployment of energy efficient motor controls. They can be controlled by a single Hall sensor, reducing system costs. Motor speed can be set by either a pulse width modulated (PWM) signal or a DC voltage and lead angle can easily be adjusted.

The parts have full protection including locked rotor protection and auto-recovery mechanisms. Soft start-up and shutdown functionality ensures that ongoing operational stability is maintained.

 

In TSSOP-20J/SSOP-20 packages, they are respectively priced at $0.938 (LV8811/LV8813) and $0.785 (LV8814) (all 2000).

 

ON Semiconductor; www.onsemi.com