Microchip has expanded its sinusoidal, sensorless, three-phase BLDC (brushless DC) fan motor driver portfolio with the MTD6505, a standalone, resistor-programmable driver that is claimed to enable the selection of multiple, back-EMF coefficient ranges. The driver is housed in a 3x3x0.5mm micro dual flat, no-lead package for space-constrained applications such as thin laptops and BLDC fans. To enable low acoustic noise and mechanical vibration, the driver has a 180° sinusoidal drive. Being sensorless, the driver is claimed to eliminate the need for an external Hall-effect sensor. Additionally, it provides many on-chip protections to avoid harmful operating conditions such as thermal shutdown, over-current limiting and lock-up protection. The company's three-phase BLDC sensorless fan controller demonstration board, the ADM00345 integrates a BLDC fan and three plug-in motor drivers.
