comment on this article

Three-phase BLDC controller and MOSFET driver IC

Allegro MicroSystems Europe has unveiled a three-phase brushless BLDC motor controller for use with N-channel external power MOSFETs. The 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 device is targeted at high current BLDC motor applications for speed, position, or torque control requirements and is intended 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 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 mm × 7 mm) power package, that is lead (Pb) free, with 100% matt-tin leadframe plating.

Author
Neil Tyler

Comment on this article


This material is protected by MA Business copyright See Terms and Conditions. One-off usage is permitted but bulk copying is not. For multiple copies contact the sales team.

What you think about this article:


Add your comments

Name
 
Email
 
Comments
 

Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles

3D objects use Wi-Fi

University of Washington researchers claim to have created 3D plastic objects ...

Primed for growth

A number of factors are driving the need for 5G deployment. The relentless ...

800W power supply

Artesyn Embedded Technologies has unveiled a 800-watt server power supply that ...

Get to market faster

A quick look at using Vicor's PFM and AIM in VIA packaging for your AC to Point ...

Broadband upgrade

BT has made an offer to the government to spend £600million to deliver 10Mbps ...

The big build

It’s fair to say that politicians, with a few noticeable exceptions, have never ...

Beyond graphene

Since the discovery of graphene in 2004, the fascination around the so called ...

The project begins

Recently, Stephen Doran took up his position as CEO of the Compound ...