TI DRV8872有刷直流马达(BDC)驱动方案
TI公司的DRV8872是有刷直流马达(BDC)驱动器,两个逻辑输入控制H桥驱动器,驱动电流高达3.6A,输入采用PWM控制马达速度,工作电压6.5-V到45-V,主要用在打印机,家用电器和工业设备以及其它小型设备.本文介绍了DRV8872主要特性,功能框图,典型应用框图以及评估模块DRV8872EVM主要特性,电路图,材料清单,PCB元件布局图和硬件设计文件.
The DRV8872 is a brushed-DC motor driver for printers, appliances, industrial equipment, and other small machines. Two logic inputs control the H-bridge driver, which consists of four N-channel MOSFETs that can control motors bidirectionally with up to 3.6-A peak current. The inputs can be pulse-width modulated (PWM) to control motor speed, using a choice of current-decay modes. Setting both inputs low enters a low-power sleep mode.
The DRV8872 features integrated current regulation, based on an internal reference voltage and the voltage on pin ISEN, which is proportional to motor current through an external sense resistor. The ability to limit current to a known level can significantly reduce the system power requirements and bulk capacitance needed to maintain stable voltage, especially for motor startup and stall conditions.
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