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| DRV8870有刷DC馬達驅動解決方案 |
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| 文章來源： 更新時間：2015/10/8 13:48:00 |
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TI公司的DRV8870是有刷DC馬達驅動器,兩個輸入控制H橋驅動器,它包括了4個N-MOSFET,雙相控制電流高達3.6A,工作電壓6.5-V到45-V,PWM控制接口,具有欠壓鎖住(UVLO),過流保護(OCP),熱關斷(TSD)和故障自動恢復等保護功能,主要用在打印機,家用電器,工業(yè)設備和其它小型設備.本文介紹了DRV8870主要特性,功能框圖,應用框圖以及評估板DRV8870EVM特性,電路圖和硬件設計文件.
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.
The device is fully protected from faults and short circuits, including under-voltage (UVLO), over-current (OCP), and over-temperature (TSD). When the fault condition is removed, the device automatically resumes normal operation.
DRV8870主要特性:
H-Bridge Motor Driver
Drives One DC Motor, One Winding of a Stepper Motor, or Other Loads
Wide 6.5-V to 45-V Operating Voltage
565-mΩ Typical RDS(on) (HS + LS)
3.6-A Peak Current Drive
PWM Control Interface
Integrated Current Regulation
Low-Power Sleep Mode
Small Package and Footprint
8-Pin HSOP WithPowerPAD
4.9 × 6.0 mm
Integrated Protection Features
VM Undervoltage Lockout (UVLO)
Overcurrent Protection (OCP)
Thermal Shutdown (TSD)
Automatic Fault Recovery
DRV8870應用:
Printers
Appliances
Industrial Equipment
Other Mechatronic Applications
圖1.DRV8870功能框圖
圖2.DRV8870應用框圖
評估板DRV8870EVM
DRV8870 H-Bridge PWM Motor Driver Evaluation Module
The DRV8870EVM is a complete solution for evaluating the DRV8870 brushed motor driver. It includes avoltage regulator to create 5 V, and a TLC555 timer configured to supply a PWM input to the DRV8870.
The EVM also includes a potentiometer to adjust the speed of the motor by varying the duty cycle of thePWM and a second potentiometer to set the chopping current value. Jumpers are provided to configureeach input to a logic low, logic high, PWM, or to allow user control of the inputs. Test points are providedfor ease of monitoring the input and output signals.
The DRV8870EVM only requires connections to the motor and power supply to operate.
圖3.評估板DRV8870EVM外形圖
圖4.評估板DRV8870EVM電路圖(1)
圖5.評估板DRV8870EVM電路圖(2) |
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