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DRV8876 N沟H桥马达驱动解决方案
文章来源:永阜康科技 更新时间:2019/8/24 9:34:00
TI公司的DRV8876是适用于各种终端应用的灵活多样的马达驱动器,集成了N沟H桥,电荷泵稳压器,电流检测和调制,电流正比输出和保护电路.电荷泵允许高边和低边N沟MOSFET和支持100%占空白比而提高了效率.集成的电流检测使得驱动器能调整起动时和大负载时的马达电流.限流可通过可调外部基准电压来设定.器件可驱动一个双向有刷DC马达,或两个单向有刷DC马达以及其它电阻和电感负载,工作电压4.5V-37V,输出电流峰值达3.5A,PH/EN和PWM H桥控制模式,单独半桥控制模式,支持1.8V,3.3V和5V逻辑输入,超低功耗睡眠模式:<1-μA @ VVM = 24-V, TJ = 25℃.集成的保护特性包括欠压锁住(UVLO),电荷泵欠压(CPUV),超电流保护(OCP),热关端(TSD),自动故障恢复和故障指标引脚(nFAULT).主要用在大型和小型家用电器,打印机和扫描仪,智能仪表,ATM,现钞点钞机和EPOS以及伺服马达和激励器,吸尘机,人形和玩具机器人.本文介绍了DRV887x系列主要特性,功能框图,应用电路,以及评估模块DRV8876x/74xEV主要特性,电路图,材料清单和PCB设计图.
The DRV887x family of devices are flexible motordrivers for a wide variety of end applications. Thedevices integrate an N-channel H-bridge, chargepump regulator, current sensing and regulation,current proportional output, and protection circuitry.
The charge pump improves efficiency by allowing forboth high-side and low-side N-channels MOSFETsand 100% duty cycle support. The family of devicescome in pin to pin,
scalable RDS(on) options to supportdifferent loads with minimal design changes.
Integrated current sensing allows for the driver toregulate the motor current during start up and highload events. A current limit can be set with anadjustable external voltage reference. Additionally,the devices provide an output current proportional tothe motor load current. This can be used to detectmotor stall or change in load conditions. Theintegrated current sensing uses an internal currentmirror architecture, removing the need for a largepower shunt resistor, saving board area and reducingsystem cost.
A low-power sleep mode is provided to achieve ultralowquiescent current draw by shutting down most ofthe internal circuitry. Internal protection features areprovided for supply undervoltage lockout (UVLO),charge pump undervoltage (CPUV), outputovercurrent (OCP), and device overtemperature(TSD). Fault conditions are indicated on nFAULT.

DRV887x系列主要特性:
1• 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
• High output current capability
– 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℃
• Spread spectrum clocking For lowelectromagnetic interference (EMI)
• Integrated protection features
– Undervoltage lockout (UVLO)
– Charge pump undervoltage (CPUV)
– Overcurrent protection (OCP)
– Thermal shutdown (TSD)
– Automatic fault recovery
– Fault indicator pin (nFAULT)

DRV887x系列应用:
• 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.DRV887x系列功能框图

图2.DRV887x系列简化电路图

图3.DRV887x系列典型应用电路图(1)

图4.DRV887x系列典型应用电路图(2)

评估模块DRV8876x/74xEV
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 halfbrid
gecontrol (Hi-Z). Power can be provided externally up to 37 V through the power header.
The DRV8876/74xEVM uses a single header for power entry to the EVM board. Only a single powersupply rail is necessary since an onboard 3.3-V regulator provides power to the MSP430. The minimum
recommended VM voltage for the EVM is 4.5 V and the maximum is 37 V. For complete voltage rangeinformation of the driver itself, refer to the device.
As previously mentioned, the MSP430 comes preprogrammed to control basic DC motor operation. Ifchanging the firmware via the external ez430™ development tool, do not supply power to the VMconnector on the EVM. The ez430™ board provides the necessary power during programming whenconnected to the J6 connector.

图5.评估模块DRV8876EVM外形图

图6.评估模块DRV8876EVM PCB 3D视图

图7.评估模块DRV8876EVM电路图

图8.评估模块DRV8876EVM PCB设计图(1)

图9.评估模块DRV8876EVM PCB设计图(2)

图10.评估模块DRV8876EVM PCB设计图(3)

图11.评估模块DRV8876EVM PCB设计图(4)

图12.评估模块DRV8876EVM PCB设计图(5)

图13.评估模块DRV8876EVM PCB设计图(6)

图14.评估模块DRV8876EVM PCB设计图(7)

图15.评估模块DRV8876EVM PCB设计图(8)


 
 
 
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