TI DRV8870有刷DC马达驱动解决方案
TI公司的DRV8870是有刷DC马达驱动器,两个输入控制H桥驱动器,它包括了4个N-MOSFET,双相控制电流高达3.6A,工作电压6.5-V到45-V,PWM控制接口,具有欠压锁住(UVLO),过流保护(OCP),热关断(TSD)和故障自动恢复等保护功能,主要用在打印机,家用电器,工业设备和其它小型设备.本文介绍了DRV8870主要特性,功能框图,应用框图以及评估板DRV8870EVM特性,电路图和硬件设计文件.
The DRV8870 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 DRV8870 features integrated current regulation, based on the analog input VREF 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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