Driver chips support higher speed fan motors

June 23, 2017 // By Nick Flaherty
Driver chips support higher speed fan motors
Toshiba has launched two three-phase brushless motor drivers that support higher speeds in small motors.

The TC78B015FTG is aimed at 12V power supply and the TC78B015AFTG for 24V power supplies in home appliances and industrial equipment.

Cooling fans in applications such as servers combine small size with a high rotation speed that ensures a high cooling capability. The new drivers in a WQFN 36 (5mm x 5mm x 0.8mm) package can be mounted on the limited board space of small motors and reduce the external component count with a one-sensor drive and current detection resistor-free system.

One-sensor driving provides more reliable motor operation than a sensorless drive and reduces the number of hall sensors from three to one. The current detection resistor-free system can reduce rated power supply and eliminate the large resistors previously required. These all contribute to reduced demand for space on wiring boards.

The high speed rotation is achieved with a 150º commutation system, faster and more stable than with a sine-wave commutation system, and vibration is lower than in a conventional 120º commutation system. The low output on-resistance of 0.24Ω reduces the heat generated from increased motor current by a high frequency drive, supporting a current drive of up to 3A.

Details are at toshiba.semicon-storage.com/ap-en/product/linear/motordriver.html

 


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