Allegro MicroSystems公司的A3916是新型低壓雙極步進(jìn)馬達或雙路馬達驅動(dòng)IC,集成了所有的馬達控制的功能,包括固定關(guān)斷時(shí)間的PWM穩壓器,單電源2.7 -15 V輸入電壓,每路輸出電流高達1A,低RDS(ON)輸出,低電流睡眠模式,過(guò)流保護,內部UVLO和熱關(guān)斷,集成了電荷泵.主要用在工業(yè)自動(dòng)化,點(diǎn)負載,3D打印,醫療設備,CCTV,玩具市場(chǎng)和其它應用.本文介紹了A3916主要特性和優(yōu)勢,框圖和典型應用電路以及演示板電路圖,材料清單和PCB設計圖.

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主要特性和優(yōu)勢:

• 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

圖1.A3916框圖

圖2. A3916典型應用電路

A3916演示板

圖3.A3916演示板電路圖

A3916演示板材料清單:

圖4.A3916演示板PCB設計圖(1)

圖5.A3916演示板PCB設計圖(2)

圖6.A3916演示板PCB設計圖(3)