Three-phase brushless fan motor driver IC controls closed loop rotation speed
Intended for small fan applications in servers, home appliances and industrial equipment, the TC78B025FTG is a three-phase brushless motor driver IC with a rotation speed control (closed loop control) function.
The cooling fans used in servers and other must be small and rotate at high speeds with uniform accuracy, explains Toshiba Electronics Europe. This is usually achieved using a speed-feedback method to suppress fluctuations in rotation speed caused by changes in the power supply voltage and load. Until the advent of the TC78B025FTG, this has required the use of microcomputers, but this IC negates external microcomputers by incorporating a non-volatile memory (NVM). This allows easy system configuration and supports motor speeds from hundreds to tens of thousands of rotations per minute (RPM). Toshiba adds that its intelligent phase control (InPAC) motor drive technology realises efficient driving across a wide rotation range without requiring adjustment.
The TC78B025FTG operates from a power supply of 4.5 to 16V and provides a sine-wave drive with 150 degree commutation. Industry-leading low on resistance of 0.2-Ohm (typical) (total of high and low sides) reduces the IC’s self-heating during operation, and extends support to large current drives. Speed is controlled by a simple PWM signal or an analogue voltage input. Integral protection includes thermal shutdown, over current protection and motor lock detection. The device is housed in a VQFN24 package measuring just 4.0 x 4.0 x 0.9mm.
A one-Hall drive system and current sense resistor-elimination system (Advanced Current Detection System – ACDS) reduce the number of external components and contribute to space saving on PCBs, says Toshiba.
The TC78B025FTG is in mass production now.
Toshiba Electronics Europe (TEE) is the European electronic components business of Toshiba Electronic Devices and Storage Corporation. TEE offers European consumers and businesses a variety of hard disk drive (HDD) products and semiconductor solutions for automotive, industrial, IoT, motion control, telecomms, networking, consumer and white goods applications. The company’s portfolio encompasses integrated wireless ICs, power semiconductors, microcontrollers, optical semiconductors, ASICs, ASSPs and discrete devices ranging from diodes to logic ICs.