TI DRV8870有刷直流马达(BDC)驱动方案
TI公司的DRV8870是有刷直流马达(BDC)驱动器,具有两个逻辑输入控制由四个N-MOSFET组成的H桥驱动器,电流可高达3.6A,采用PWM来控制马达速度.器件具有故障和短路保护特性,包括UVLO,OCP和TSD保护.主要用在打印机,家用电器和工业设备等.本文介绍了DRV8870主要特性,框图,应用连接图,DRV8870评估模块特性,电路图,材料清单和PCB设计图.
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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