Allegromicro A4980汽车步进马达驱动方案
Allegromicro公司的 A4980是可编程的汽车微步进马达驱器,驱车电压高达28V,驱动电流±750 mA.设计用于以满步,半步,1/4步和1/16步驱动双向马达.器件内部集成了OVLO, UVLO和热关断电路,主要用在汽车步进马达,引擎管理和头灯定位.本文介绍了A4980主要特性和优势,功能方框图, 串行和并行接口控制应用电路图.
The A4980 is a flexible microstepping motor driver with built-in translator for easy operation. It is a single-chip solution, designed to operate bipolar stepper motors in full-, half-, quarter- and sixteenth-step modes, at up to 28 V and ±750 mA. The A4980 can be controlled by simple Step and Direction inputs, or through the SPI-compatible serial interface that also can be used to program many of the integrated features and to read diagnostic information.
The current regulator can be programmed to operate in fixed off-time or fixed frequency PWM, with several decay modes to reduce audible motor noise and increase step accuracy. In addition the phase current tables can be programmed via the serial interface to create unique microstep current profiles to further improve motor performance for specific applications.
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