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3-ph. brushless motor drivers handle fast rotation for small motors

3-ph. brushless motor drivers handle fast rotation for small motors

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By eeNews Europe



 

Typically, cooling fans combine minimum size with a high rotation speed; these driver ICs are packaged in small WQFN 36 (5 x 5 x 0.8 mm) outlines to mount on the limited PCB space found in small motors. They 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. The resistor-free current detection system can reduce the power supply rating and eliminate the large resistors previously required.

 

High speed rotation is achieved with a 150-degree commutation system. 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: 0.24Ω (typ.)) reduces heat generation due 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.

 

Toshiba; www.toshiba.semicon-storage.com

 

 

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