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Toshiba’s New Three-phase Brushless Motor Drivers Realize High Speed Rotation for Small Motors

2017-06-22 | Return

TOKYO – Toshiba Corporation's (TOKYO: 6502) Storage & Electronic Devices Solutions Company today announced the launch of the three-phase brushless motor drivers “TC78B015FTG” for 12 V power supply and “TC78B015AFTG” for 24 V power supply. The new ICs support high speed rotation of small fan motors suited to home appliances and industrial equipment. Mass production starts today.

Ideally, cooling fans, such as server fans, combine minimized size with a high rotation speed that ensures a high cooling capability. Toshiba’s new products adopt small packages that can be mounted on the limited board space of small motors. They also reduce the external component count with a one-sensor drive and current detection resistor-free system. One-sensor driving secures more reliable motor operation than a sensorless drive and reduces the number of hall sensors from three (required for a 3-sensor drive) 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.

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.)) ensures suppression of heat generated from increased motor current by a high frequency drive, realizing support of a large current drive of up to 3A.
Main Features of New Product

1.Small package

WQFN 36 (5mm x 5mm x 0.8mm) package that can be mounted on the limited board space of small fans.

2.Space saving for boards

One-sensor drive and current detection resistor-less system save space previously required for mounting external components.

3.High speed rotation

A 150-degree commutation system realizes faster and more stable rotation than a sine-wave commutation system and lower vibration than a 120-degree commutation system.

4.Low loss

IC loss during motor operation can be suppressed by low on-resistance of 0.24 Ω (typ.).

Main Specifications

Part number	TC78B015FTG	TC78B015AFTG
Power supply voltage (operation range)	6 V to 22 V	6 V to 30 V
Output current (operation range)	3A
Driving system	150-degree commutation system
Hall sensor	One sensor
Current detection resistor	Unnecessary
Other features	Support Hall devices and Hall ICs
	Speed control input: PWM input or analog voltage input
	Abnormal detection functions: Thermal shutdown, overcurrent detection, and motor lock detection
	Output on-resistance (upper + lower): 0.24 Ω (typ.)
Package	WQFN36 (5 mm × 5 mm × 0.8 mm)

Source：http://www.semicon.toshiba.co.jp/eng/