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| DRV8874 38V 6A H桥马达驱动方案 |
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| 文章来源：永阜康科技 更新时间：2020/7/1 9:54:00 |
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TI公司的DRV8874是集成的38V 6A H桥马达驱动器.器件集成了N沟H桥MOSFET,电荷泵,电流检测和正比例输出,电流调节器和保护电路.电荷泵支持N沟MOSFET半桥和100%占空比驱动,从而提高了效率.器件系列产品引脚到引脚有不同的RDS(on)参数,以最少的设计改变,支持不同的负载要求.器件的IPROPI引脚上的内部电流镜像架构实现了电流检测和电流调整.这就不需要大的功率并联电阻,节省板面积和降低系统成本.IPROPI引脚的电流检测输出允许微控制器检测负载条件下马达失速或变化.N沟H桥马达驱动器能驱动一个双向有刷直流马达,或两个单向有刷直流马达,以及其它电阻和感性负载.工作电压4.5V到37V.支持1.8V,3.3V和5V逻辑输入.器件具有超低功耗睡眠模式:<1-μA @ VVM = 24-V, TJ = 25℃.广谱时钟降低了电磁干扰(EMI).器件集成的保护特性包括欠压锁住(UVLO),电荷泵欠压(CPUV),过流保护(OCP),热关断(TSD)和自动重试或输出锁定(IMODE).器件具有自动故障恢复和故障指示引脚(nFAULT).主要用在有刷直流马达,家用电器,真空泵,仿人机器人和玩具机器,打印机和扫描仪,智能表,ATM,点钞机和EPOS,伺服马达和激励器.本文介绍了DRV8874主要特性,功能框图,典型应用电路和评估模块DRV8876x/74xEVM主要特性,电路图,材料清单和PCB设计图.
The DRV8874 is an integrated motor driver with NchannelH-bridge, charge pump, current sensing andproportional output, current regulation, and protectioncircuitry. The charge pump improves efficiency bysupporting N-channel MOSFET half bridges and100% duty cycle driving. The family of devices comein pin-to-pin RDS(on) variants to support different loadswith minimal design changes.
An internal current mirror architecture on the IPROPIpin implements current sensing and regulation. Thiseliminates the need for a large power shunt resistor,saving board area and reducing system cost. TheIPROPI current-sense output allows a microcontrollerto detect motor stall or changes in load conditions.
Using the external voltage reference pin, VREF,these devices can regulate the motor current duringstart-up and high-load events without interaction froma microcontroller.A low-power sleep mode achieves ultra-low quiescentcurrent draw by shutting down most of the internalcircuitry. Internal protection features include supplyundervoltage lockout, charge pump undervoltage,output overcurrent, and device overtemperature.Fault conditions are indicated on nFAULT.
DRV8874主要特性:
• N-channel H-bridge motor driver
– Drives one bidirectional brushed DC motor
– Two unidirectional brushed DC motors
– Other resistive and inductive loads
• 4.5-V to 37-V operating supply voltage range
• Pin to pin RDS(on) variants
– DRV8874: 200-mΩ (High-Side + Low-Side)
– DRV8876: 700-mΩ (High-Side + Low-Side)
• High output current capability
– DRV8874: 6-A Peak
– DRV8876: 3.5-A Peak
• Integrated current sensing and regulation
• Proportional current output (IPROPI)
• Selectable current regulation (IMODE)
– Cycle-by-cycle or fixed off time
• Selectable input control modes (PMODE)
– PH/EN and PWM H-bridge control modes
– Independent half-bridge control mode
• Supports 1.8-V, 3.3-V, and 5-V logic inputs
• Ultra low-power sleep mode
– <1-μA @ VVM = 24-V, TJ = 25°C
• Spread spectrum clocking for low electromagneticinterference (EMI)
• Integrated protection features
– Undervoltage lockout (UVLO)
– Charge pump undervoltage (CPUV)
– Overcurrent protection (OCP)
– Automatic retry or outputs latched off(IMODE)
– Thermal shutdown (TSD)
– Automatic fault recovery
– Fault indicator pin (nFAULT)
DRV8874应用:
• Brushed DC motors
• Major and small home appliances
• Vacuum, humanoid, and toy robotics
• Printers and scanners
• Smart meters
• ATMs, currency counters, and EPOS
• Servo motors and actuators
图1.DRV8874功能框图
图2.DRV8874典型应用电路
评估模块DRV8876x/74xEVM
The DRV8876x/74xEVM is a complete solution for evaluating the DRV8876/74x H-bridge motor drivers. Itincludes an MSP430™ microcontroller that is preprogrammed to take input from two dedicated analogpotentiometers for PWM speed control of one or two brushed DC motors. The jumper on the PMODE pinallows the user to select from the input modes of PH/EN (GND), PWM (3.3 V), and independent halfbridgecontrol (Hi-Z). Power can be provided externally up to 37 V through the power header. To expand beyond the included firmware capability, the MSP430 MCU can be reprogrammed through the eZ-FETemulation circuit found in newer MSP430 Launchpads. We recommend the http://www.ti.com/tool/MSPEXP430FR5969.
Note that a four pin angled male header is required and must be soldered to J21 of this Launchpad from V+ pin to GND pin. We recommend a pin header with pin dimensions like 850-10-050-20-001000. The U1 MCU must be removed from the Launchpad.
The DRV8874 evaluation module (EVM) allows easy evaluation of the DRV8874 device.The DRV8874 device is an integrated H-bridge driver for brushed DC and solenoid applications. The evaluation module allows the device to be configured for PWM, phase/enable, or independent half-bridge control modes. An MSP430FR2100 on the board provides PWM signals to the input pins of the DRV8874EVM. The duty cycles of the PWM signals are set by potentiometers on the board.
For more information on this evaluation module please refer to the DRV8874EVM User ’s Guide.
评估模块DRV8876x/74xEVM主要特性:
4.5-V to 37-V operating voltage range
6-A peak current
Configurable control modes including PH/EN, PWM, and independent half-bridge
Integrated current sense and current regulation
图3.评估模块DRV8876x/74xEVM外形图(单个H桥马达驱动器)
图4.评估模块DRV8876x/74xEVM PCB装配面3D图
图5.评估模块DRV8876x/74xEVM电路图:MD014B(002)
图6.评估模块DRV8876x/74xEVM电路图:MD014B(002)
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