Maxim MAX22204 65V 3.8A步进马达驱动器解决方案

Maxim公司的MAX22204是两相步进马达驱动器,集成了两个65V 最大3.8A的H桥.H桥FET有非常低的阻抗,导致高驱动效率和最小的热量.典型的总RON(高边+低边)是0.3Ω.MAX22204集成了精确电流驱动稳压电路和128微步内置分度器,由STEP/DIR接口控制.高微步进分辨率和先进控制技术保证了平衡和安安静静工作.流进两个低边FET的电流由非耗散集成电流检测(ICS)来检测,然后和所需的步进阈值电流和比较.只要桥电流超过阈值(ITRIP),器件强迫衰减到固定OFF时间(tOFF).器件具有过流保护(OCP),热关断(TSD)和欠压锁住(UVLO).故障条件检测时,漏极开路低FAULT引脚就进行激活.在热关断和欠压锁住期间,驱动器是禁止的,直到正常工作条件恢复.采用5mmx7mm TQFN38封装.主要用在步进马达驱动器.本文介绍了MAX22204主要特性,简化框图,功能框图和应用框图,以及评估板MAX22204 EVK优势,电路图,材料清单和PCB设计图.

 The MAX22204 is a two-phase stepper motor driver. It integrates two 65V, 3.8AMAX H-Bridges. The H-Bridge FETs have very low impedance, resulting in high driving efficiency and minimal heat. The typical total RON (high-side + low-side) is 0.3Ω. The MAX22204 integrates an accurate current drive regulation circuit and a 128-microstep built-in indexer controlled by a STEP/DIR interface. The high microstep resolution and advanced control technique ensure smooth and quiet operations.

The current flowing into the two low-side FETs is sensed by a non-dissipative Integrated Current Sensing (ICS) and it is then compared with the desired step threshold current. As soon as the bridge current exceeds the threshold (ITRIP), the device enforces the decay for a fixed OFF-time (tOFF).

The non-dissipative ICS eliminates the bulky external power resistors normally required for this function, resulting in a dramatic space and power saving compared with mainstream applications based on the external sense resistor. Currents proportional to the internally-sensed bridge currents are output to pins ISENA and ISENB. By connecting external resistors to these pins, voltages proportional to the bridge currents are generated. These can b...