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[原创] Allegro A3916双路DMOS全桥马达驱动方案

关键词:马达驱动 PWM DMOS A3916

时间:2017-03-17 16:00:19       作者:Allegro       来源:中电网

Allegro MicroSystems公司的A3916是新型低压双极步进马达或双路马达驱动IC,集成了所有的马达控制的功能,包括固定关断时间的PWM稳压器,单电源2.7 -15 V输入电压,每路输出电流高达1A,低RDS(ON)输出,低电流睡眠模式,过流保护,内部UVLO和热关断,集成了电荷泵.主要用在工业自动化,点负载,3D打印,医疗设备,CCTV,玩具市场和其它应用.本文介绍了A3916主要特性和优势,框图和典型应用电路以及演示板电路图,材料清单和PCB设计图.

Allegro MicroSystems, LLC announces a new low voltage bipolar stepper or dual DC motor driver IC. The A3916 device was designed for pulse-width-modulated (PWM) control of low-voltage stepper motors or dual DC motors and is capable of output currents up to 1 A per channel and operating voltages from 2.7 to 15 V. Allegro’s new motor driver IC is targeted at the office and industrial automation, point of sale, 3 D printing, medical, CCTV, toy markets, and other applications that run off single, Li-ion cell or 3 AA batteries.

The A3916 integrates all motor control including a fixed off-time PWM regulator that sets a peak current in motor winding based on the selection of a low value a current sense resistor. A single supply eliminates the need for external LDO and an integrated charge pump requires only one external capacitor. Output diagnostic is provided by an active low fault output that notifies the user of a TSD or overcurrent protection event.

Designed for pulse-width-modulated (PWM) control of lowvoltagestepper motors and single and dual DC motors, theA3916 is capable of output currents up to 1 A per channel andoperating voltages from 2.7 to 15 V.

The A3916 has an internal fixed off-time PWM timer that setsa peak current based on the selection of a current sense resistor.

An output fault flag is provided that notifies the user of a TSDor overcurrent protection event.

The A3916 is supplied in a low-profile 3 × 3 mm 16-terminalQFN (suffix “ES”) and a low-profile 4 × 4 mm 20-terminalQFN (suffixes “ES, -1”) both with exposed power tabs for

enhanced thermal dissipation.

A3916主要特性和优势:

• Wide, 2.7 to 15 V input voltage operating range

• Dual DMOS full-bridges: drive two DC motors orone stepper motor

• Low RDS(ON) outputs

• Synchronous rectification for reduced power dissipation

• Low-current sleep mode

• Overcurrent protection

• Internal UVLO and thermal shutdown circuitry

• Integrated charge pump

• Pin-to-pin compatible with A3906

图1.A3916框图

图2. A3916典型应用电路

A3916演示板

图3.A3916演示板电路图

A3916演示板材料清单:

图4.A3916演示板PCB设计图(1)

图5.A3916演示板PCB设计图(2)

图6.A3916演示板PCB设计图(3)

详情请见:

http://www.allegromicro.com/en/Products/Motor-Driver-And-Interface-ICs/Brush-DC-Motor-Drivers/A3916.aspx

A3916-Datasheet.pdf

A3916-Demo-Board-Schematic.pdf

 

 

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