Allegro MicroSystems: three-phase BLDC controller and MOSFET driver IC

Allegro MicroSystems Europe has announced a new three-phase brushless BLDC motor controller for use with N-channel external power MOSFETs.  Allegro’s AMT49413 incorporates much of the circuitry required to design a cost-effective, three-phase motor drive system with maximum supply voltages up to 50 V. This new device is targeted at high current BLDC motor applications for speed, position, or torque control requirements.  It has been designed for battery powered power tools, lawn and garden equipment and factory automation, pumps, fans, blowers and appliance applications within the consumer and industrial markets.

The AMT49413 provides functionality over a wide input supply range. A unique charge pump regulator provides adequate (>10 V) gate drive for battery voltages down to 7 V, and allows the device to operate with a reduced gate drive at supply voltages down to 5.5 V.  A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs.  An internal charge pump for the high-side drive allows for DC (100% duty cycle) operation.

Internal fixed-frequency PWM current control circuitry can be used to regulate the maximum load current. The peak load current limit is set by the selection of an input reference voltage and external sensing resistor. The PWM frequency is set by a user-selected external RC timing network. For added flexibility, the PWM input can be used to provide speed and torque control, allowing the internal current control circuit to set the maximum current limit.  Efficiency is enhanced by using synchronous rectification.

A full suite of protection features is provided including MOSFET shoot-through, undervoltage, overvoltage, HALL logic fault, low motor current and short to ground, supply and across motor winding. The dead time can be set by a single external resistor. The AMT49413 is supplied in a 48-pin QFN with exposed thermal pad. This is a small footprint (7 × 7 mm) power package, that is lead free, with 100% matt-tin leadframe plating. 


ZES Zimmer on testing advanced power electronics

In this video Bernd Neuner from ZES Zimmer talks to Alix Paultre for Electronic News TV at the 2017 Power Electronics Conference in Nuremberg. The discussion deals with the issues involving test and m...


Weidmüller discusses the need for a better signal and power interface

In this video Rene Arntzen from Weidmüller talks to Alix Paultre of Electronic News TV about the importance of a good signal and power interface for industrial equipment. There is currently no good ...


Mouser talks about the state of engineering development today

In this video Mark Burr-Lonnon and Graham Maggs of Mouser Electronics, a major international electronics distributor, talk to Alix Paultre about the state of engineering development today. With massiv...


Infineon launches a new family of configurable industrial drive boards

In this video Infineon explains their new family of configurable industrial drive boards at SPS-IPC Drives 2017. Intended to enable easy setup and deployment, the XMC-based automation boards can handl...


STMicro explains their STSPIN family of single-chip motor drivers

In this video STMicroelectronics explains their STSPIN single-chip motor drivers at SPS-IPC Drives 2017. The STSPIN family embeds can drive motors efficiently and with high accuracy, with an advanced ...