This is a sensorless 3-phase brushless motor controller solution based on Toshiba TC78B009FTG, applied in server cooling fans, blowers, pumps, cordless vacuum cleaners, robot vacuum cleaners, etc.

Block diagram:

Physical :

Case features:
1. Rated working voltage range: 15.5-21V, suitable for 18V lithium battery pack platform
2. Support: forward, reverse, braking, and standby functions to meet various control scenario requirements.
3. Support speed control through duty cycle PWM signal, analog voltage signal, and I2C.
4. Support various settings through the I2C interface.
5. No external MCU is required, as this IC has built-in NVM and can be used for speed setting.
6. Optional closed-loop or open-loop speed control.
7. It contains over current detection protection, under voltage locking, and over temperature protection to prevent potential safety hazards and ensure safer use.

TC78B009FTG features:

● Sensorless PWM drive
● Capable to drive Delta or Wye configured motors
● Operating voltage: 5.5 to 27V (absolute maximum rating: 30V)
● Predriver for high side and low side N-ch MOSFETs drive
● 8 selectable levels of gate drive current
● Built-in closed loop speed control with adjustable speed curve
● Motor speed control by analog voltage, PWM duty cycle, or I2C
● Serial interface (I2C) for various settings
● Standby mode (by STBY pin)
● Current monitor output (PHBF pin)
● CW/CCW control (CWCCW pin)
● Brake input pin (BRAKE pin)
● Rotation speed output (FG pin)
● Abnormality detection output (ALERT pin)
● Thermal shutdown (TSD)
● Under voltage lockout (UVLO)
● Charge pump low voltage detection (CPVSD)
● Output current limit (OCP)
● Over current detection (ISD)
● Lock protection
● Small QFN36 package