Intelligent Phase Control and Closed Loop Speed Control for 3-Phase Motors
Toshiba America Electronic Components, Inc. has launched the TC78B027FTG, a three-phase brushless motor control pre-driver IC with Intelligent Phase Control (InPAC) technology that enables optimum operating efficiency in applications such as high-velocity server fans, blowers and pumps.
In recent years, advances in server capacity and performance require larger and higher velocity fans for cooling the excess heat generated by the equipment. Initial target applications include cooling fans for servers and blowers.
Similarly, small blowers, vacuums and pumps also operate with high-speed impellers that require high power capability. TC78B027FTG is a brushless motor controller with pre-driver that can drive a wide range of external MOSFETs to meet such challenges.
TC78B027FTG features Intelligent Phase Control (InPAC) and Closed Loop Speed Control technologies. InPAC offers high-efficiency drive by synchronizing the phases of the driving voltage and current, thereby delivering maximum real power to the loads.
This operation is usually not possible without some kind of compensation, which generally requires significant motor characterizations upfront and operation adjustments in real time to achieve the optimum efficiency throughout the speed range. InPAC, on the other hand, is an automatic function that requires initialization during design and therefore minimizes adjustment burdens and speeds up the development time.
A closed loop speed control function regulates and maintains the motor rotational speed under dynamic power fluctuations and load variations, a valuable feature for mission-critical applications such as server fans and other cooling applications. Precise setting of a speed profile is done by the built-in non-volatile memory (NVM) in the TC78B027FTG which eliminates the need for an external MCU for a closed loop speed control.
TC78B027FTG solutions also simplify motor selections—TC78B027FTG requires only one Hall sensor input that can be used either with a single Hall sensor motor or the conventional 3 Hall sensors motors. The IC also employs either a Hall sensor analog or Hall IC digital signal for rotor position detection, which truly simplifies users' motor selection tasks.
For low power applications, designers can also consider TC78B027FTG fully integrated driver version, TC78B025FTG, which covers 16V/3.5A applications.
- Intelligent phase control optimizes efficiency over a wide operating range.
- InPAC, a technology developed by Toshiba, realizes an automatically optimized high-efficiency drive in a wide range of rotational speeds. Adjustment burden is also reduced.
- Stable rotational speed under disturbances
- A closed loop speed control function regulates motor rotational speed fluctuations caused by changes in power supply voltage and load. An external MCU is not required because the IC has an internal NVM for speed profile setting.
- Flexible in various power applications with appropriate external FETs
- Various FETs can be used, and TC78B027FTG solutions cover a wide range of low-to-medium power applications.