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High‐efficiency three‐phase BLDC motor driver incorporating the InPAC function: TC78B016FTG

Photos of the TC78B016FTG.

Three‐phase BLDC motors are used for a wide range of applications, including electric fans, refrigerators, air conditioners, printers and multi-function peripherals (MFPs). However, conventional motor controllers and drivers have the following drawbacks:

  • To optimize motor efficiency, the lead angle must be adjusted using actual equipment.
  • The lead angle must also be adjusted according to the motor constants, rpm and other factors even when a motor controller/driver has an auto lead angle control function.Therefore, there has been a need for an improved control method that reduces burdens on users.

To resolve these issues, Toshiba has developed Intelligent Phase Control (InPAC), an auto lead angle control technology, based on its outstanding motor driver IC. InPAC achieves optimized phase control by detecting the motor current phase.

Main specifications

Part number TC78B016FTG
Operating supply voltage range 6 to 30 V
Operating output current 3 A
Drive method Sine-wave drive
Other features Auto lead angle: InPAC function (Voltage/current: optimized phase control)
Support for Hall devices and Hall ICs
Speed control inputs: PWM inputs or analog voltage input
Abnormal detection functions: Thermal shutdown, overcurrent detection, motor lock detection
Output on-resistance (upper + lower): 0.23 Ω typ.
Soft start function, settings of acceleration and deceleration rates
Rotation direction select pin, brake pin
Prevention of supply voltage overshoot
Package WQFN36(5 mm × 5 mm × 0.8 mm)

Description of Intelligent Phase Control (InPAC), an Auto Lead Angle Control Technology

Description of an Auto Lead Angle Control Technology

Comparisons between auto lead angle technology and the conventional technology

Drawbacks of conventional technology

To optimize motor efficiency, the lead angle must be adjusted using actual equipment although it is controlled based on the information on rotor positions from Hall sensors.
The lead angle must also be adjusted according to the motor constants, rpm and other factors even when a motor controller/driver has an auto lead angle control function. Therefore, there has been a need for an improved control method that reduces burdens on users.

Advantages of InPAC

InPAC detects the motor current phase and feeds back the information for auto lead angle control. When a motor application has a sensor, the phase of the Hall signal is automatically adjusted to match that of the motor drive current.
High efficiency is achieved regardless of the rpm, load torque and power supply voltage of a motor. InPAC also helps reduce the number of external parts necessary for lead angle adjustment.

Auto lead control technology realizing high efficiency with a simple configuration

High efficiency: InPAC can achieve maximum efficiency regardless of motor rpm

Example: At 3000 rpm, InPAC reduces supply current by approx. 10% compared with the conventional fixed lead angle control.
(as benchmarked by Toshiba)

Auto lead control technology realizing high efficiency with a simple configuration

Trend of three-phase BLDC motor technology and Toshiba solutions

Trend of three-phase BLDC motor technology and Toshiba solutions

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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.