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Introducing the MA853 ASIC: A Joint Effort for Superior Thermal Performance

In systems such as servers, switches, power supplies, inverters, and solar panels, cooling fans play a critical role and have a profound impact on system stability and performance. To meet the thermal management demands of these high-demand products, Megawin Technology has partnered with Toshiba Electronic to co-develop and recently launch a new generation BLDC ASIC — the MA853. This three-phase brushless motor control ASIC integrates Intelligent Phase Control (InPAC) technology and closed-loop speed control, significantly enhancing drive efficiency and rotational speed stability.

Megawin Technology’s server cooling fan solution adopts the 32-bit ASIC (MA853) as the main controller, featuring a dual-core architecture with Cortex®-M0 and an MCD motor control module of Toshiba Electronic to enable high-efficiency full-sine wave drive control. The MA853 integrates a high-performance gate driver capable of flexibly driving various external N-MOSFET components, offering both high integration and flexibility. It supports multi-point speed control and incorporates multiple protection mechanisms, effectively enhancing the fan’s operational stability and safety — meeting the stringent requirements of various high-efficiency cooling applications.

InPAC: The Key to Optimizing Motor Performance

InPAC intelligently adjusts the phase between driving voltage and current to achieve perfect synchronization, enabling high-efficiency operation and unlocking the motor’s maximum effective power. This innovative hardware technology automatically initializes during the early stage of motor tuning. By detecting load changes in real time and dynamically optimizing motor parameters, it significantly reduces manual tuning efforts, shortens development time, and greatly enhances product development efficiency and stability.

Intelligent Tuning for Stable Drive Performance

Traditional sensor-based motors typically require three Hall sensors (Hall Latched) to detect rotor position. In contrast, the MA853 used in this solution only requires a single Hall element for detection, significantly simplifying the hardware design. Furthermore, during the tuning phase, the MA853 eliminates the need to modify code via Keil C. Instead, all parameter configurations can be easily completed through a dedicated UI interface.

The UI interface supports register read/write, parameter save/load, and value comparison functions, making the development and tuning process more intuitive and efficient. Through the UI, users can configure over-voltage and under-voltage protection to prevent the motor from operating outside its rated voltage range, ensuring system stability and safety.

For speed control, the MA853 supports multi-point PWM curve slope adjustment, allowing input duty cycles to be mapped to output duty cycles. This enables linear control of motor speed or customized non-linear output based on specific application requirements.

Closed-Loop Speed Control — the Ideal Choice for Cooling Applications

The MA853 supports closed-loop speed control technology, which intelligently adjusts and stabilizes motor speed in response to dynamic power fluctuations and load changes. This function is especially valuable for critical applications such as server cooling fans and other scenarios where thermal stability is crucial.

Moreover, in typical motor controllers, when the external PWM input is 0 and the motor is rotated by external force, the controller may still output an FG (Frequency Generator) signal, potentially causing the host system to mistakenly detect the motor as running. Megawin Technology’s MA853 features a smarter design: it outputs the FG signal only when a valid PWM duty cycle is detected (i.e., greater than the stop threshold set in the UI) or when the PWM signal is at a high level. This effectively prevents false detections, ensuring accurate and reliable system monitoring.

Solution Features

Intelligent Phase Control (InPAC), Closed-Loop Speed Control Technology

● Dual-core Cortex®-M0 with MCD motor control, QFN32 package (4x4x0.85mm)
● Built-in 5V LDO and N/N Gate Driver, fit into 25mm PCB like donuts
● Supports sensor-based full sine-wave control with only one Hall element or latch
● Voltage 12V, PWM carrier up to 93.7 kHz, and RPM up to 50,000 rpm
● Parameters can be set via software and program control can be performed through 4 Lines (COM port)
● Multi-points speed control for greater flexibility
● Open/Closed loop control, over-/under-voltage protection (FM/HW), over-temperature protection (HW), and over-current protection (HW)

Applications

Cooling fans for servers, blowers and solar panels/systems, and more.