Three-phase brushless motor drivers support high-speed rotation in small fans
Targeted at home appliance and industrial equipment applications are two new three-phase brushless motor drivers from Toshiba Electronics Europe. The TC78B015FTG is for 12V power supply applications and TC78B015AFTG supports applications using 24V and the new ICs support high-speed rotation of small fan motors.
In an ideal situation cooling fans, such as those found in servers, combine minimum size with a high rotation speed tso ensuring maximum cooling capability. Toshiba’s new driver ICs are within small WQFN 36 (5 x 5 x 0.8-mm) packages that can be mounted on the limited PCB space found in small motors.
The new ICs also reduce the external component count by incorporating a one-sensor drive and current detection resistor-free system. One-sensor driving reduces the number of hall sensors from three to one and ensures more reliable motor operation than a comparable sensorless drive, says Toshiba. The resistor-free current detection system can reduce the power supply rating and eliminate the large resistors previously required. All these innovations contribute to reduced demand for space on wiring boards.
High-speed rotation is achieved with a 150-degree commutation system. Toshiba claims that rotation is faster and more stable than with a sine-wave commutation system, and vibration is lower than in a conventional 120-degree commutation system.
Adoption of low on-resistance (upper + lower: 0.24-Ohm (typ.)) reduces heat generation owing to the increased motor current found in high frequency drives.
The TC78B015FTG operates with a supply in the range 6V to 22V and the TC78B015AFTG requires a supply in the range 6V to 30V. Both devices support output currents up to 3A and support Hall devices, as well as offering a range of protection functions including thermal shutdown, overcurrent detection and motor lock detection.
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