A4988SET 刚刚到货 原装进口

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A4988SET 刚刚到货 原装进口

A4988 A4988SET A4988SETTR-T

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A4988: 带转换器和过流保护的 DMOS 微步驱动器

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A4988SET.jpg


A4988 是一款完全的微步电动机驱动器,带有内置转换器,易于操作。该产品可在全、半、1/4、1/8 及 1/16 步进模式时操作双极步进电动机,输出驱动性能可达 35 V及 ±2 ?A。A4988 包括一个固定关断时间电流稳压器,该稳压器可在慢或混合衰减模式下工作。

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转换器是 A4988 易于实施的关键。只要在“步进”输入中输入一个脉冲,即可驱动电动机产生微步。无须进行相位顺序表、高频率控制行或复杂的界面编程。A4988 界面非常适合复杂的微处理器不可用或过载的应用。

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在微步运行时,A4988 内的斩波控制可自动选择电流衰减模式(慢或混合)。在混合衰减模式下,该器件初始设置为在部分固定停机时间内快速衰减,然后在余下的停机时间慢速衰减。混合衰减电流控制方案能减少可听到的电动机噪音、增加步进精确度并减少功耗。

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提供内部同步整流控制电路,以改善脉宽调制 (PWM) 操作时的功率消耗。内部电路保护包括:带滞后的过热关机、欠压锁定 (UVLO) 及交叉电流保护。不需要特别的通电排序。

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A4988 采用表面安装 QFN 封装 (ES),尺寸为 5 mm × 5 mm, 标称整体封装高度为0.90 mm ,并带有外露散热板以增强散热功能。该封装为无铅封装(后缀 –T),采用 100% 雾锡电镀引脚框。

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特点和优点

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低 RDS(开) 输出

自动电流衰减模式检测/选择

混合与慢电流衰减模式

对低功率耗散同步整流

内部 UVLO

交叉电流保护

3.3 及 5 V 兼容逻辑电源

过热关机电路

接地短路保护

加载短路保护

五个可选的步进模式:全、 1/2、1/4、1/8 及 1/16

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包装

A4988 采用表面安装 QFN 封装 (ES),尺寸为 5 mm × 5 mm, 标称整体封装高度为0.90 mm ,并带有外露散热板以增强散热功能。该封装为无铅封装(后缀 –T),采用 100% 雾锡电镀引脚框。

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A4988SE.jpg

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? ? ? ? ? 完整型号

型号?? ? ? ? 封装类型?? ? ? ? ? 温度

A4988SETTR-T?28-lead QFN?-20 ° C to 85 ° C

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品牌销售专员:黄小姐

销售直线: 15013553132

QQ: 1354906433

MSN/E-mail : zoe_hxe@hotmail.com

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只卖全新原装进口货,诚信第一,专为工厂配单!欢迎您随时来电洽谈

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A4988: DMOS Microstepping Driver with Translator and Overcurrent Protection

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The A4988 is a complete microstepping motor driver with built-in translator?for easy operation. It is designed to operate bipolar stepper motors in?full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output?drive capacity of up to 35 V and ±2 A. The A4988 includes a fixed off-time?current regulator which has the ability to operate in slow or mixed decay?modes.

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The translator is the key to the easy implementation of the A4988. Simply?inputting one pulse on the STEP input drives the motor one microstep. There?are no phase sequence tables, high frequency control lines, or complex?interfaces to program. The A4988 interface is an ideal fit for applications?where a complex microprocessor is unavailable or is overburdened.

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During stepping operation, the chopping control in the A4988 automatically?selects the current decay mode, Slow or Mixed. In Mixed decay mode, the?device is set initially to a fast decay for a proportion of the fixed off-time, then to a slow decay for the remainder of the off-time. Mixed decay?current control results in reduced audible motor noise, increased step?accuracy, and reduced power dissipation.

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Internal synchronous rectification control circuitry is provided to improve?power dissipation during PWM operation. Internal circuit protection?includes: thermal shutdown with hysteresis, undervoltage lockout (UVLO),and crossover-current protection. Special power-on sequencing is notrequired.

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The A4988 is supplied in a surface mount QFN package (ES), 5 mm × 5 mm,with a nominal overall package height of 0.90 mm and an exposed pad forenhanced thermal dissipation. It is lead (Pb) free (suffix –T), with 100%matte tin plated leadframes.

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FEATURES & BENEFITS


Low RDS(ON) outputs

Automatic current decay mode detection/selection

Mixed and Slow current decay modes

Synchronous rectification for low power dissipation

Internal UVLO

Crossover-current protection

3.3 and 5 V compatible logic supply

Thermal shutdown circuitry

Short-to-ground protection

Shorted load protection

Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16

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PACKAGING


The A4988 is supplied in a surface mount QFN package (ES), 5 mm × 5 mm,with a nominal overall package height of 0.90 mm and an exposed pad forenhanced thermal dissipation. It is lead (Pb) free (suffix –T), with 100%matte tin plated leadframes.

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A4988SE.jpg

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Part Number Specifications and Availability

Part Number?Package Type?? Temperature??

A4988SETTR-T?28-lead QFN?-20 ° C to 85 ° C

4988ET

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YXF INTERNATIONAL (HK) CO., LIMITED

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Contact Person: Nina Huang?

Mobile phone: 086-15013553132

QQ: 1354906433?

MSN/E-mail : zoe_hxe@hotmail.com

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