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| DRV8874 38V 6A H橋馬達驅動方案 |
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| 文章來源：永阜康科技 更新時間：2020/7/1 9:54:00 |
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TI公司的DRV8874是集成的38V 6A H橋馬達驅動器.器件集成了N溝H橋MOSFET,電荷泵,電流檢測和正比例輸出,電流調節器和保護電路.電荷泵支持N溝MOSFET半橋和100%占空比驅動,從而提高了效率.器件系列產品引腳到引腳有不同的RDS(on)參數,以最少的設計改變,支持不同的負載要求.器件的IPROPI引腳上的內部電流鏡像架構實現了電流檢測和電流調整.這就不需要大的功率并聯電阻,節省板面積和降低系統成本.IPROPI引腳的電流檢測輸出允許微控制器檢測負載條件下馬達失速或變化.N溝H橋馬達驅動器能驅動一個雙向有刷直流馬達,或兩個單向有刷直流馬達,以及其它電阻和感性負載.工作電壓4.5V到37V.支持1.8V,3.3V和5V邏輯輸入.器件具有超低功耗睡眠模式:<1-μA @ VVM = 24-V, TJ = 25℃.廣譜時鐘降低了電磁干擾(EMI).器件集成的保護特性包括欠壓鎖住(UVLO),電荷泵欠壓(CPUV),過流保護(OCP),熱關斷(TSD)和自動重試或輸出鎖定(IMODE).器件具有自動故障恢復和故障指示引腳(nFAULT).主要用在有刷直流馬達,家用電器,真空泵,仿人機器人和玩具機器,打印機和掃描儀,智能表,ATM,點鈔機和EPOS,伺服馬達和激勵器.本文介紹了DRV8874主要特性,功能框圖,典型應用電路和評估模塊DRV8876x/74xEVM主要特性,電路圖,材料清單和PCB設計圖.
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應用:
• 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
圖1.DRV8874功能框圖
圖2.DRV8874典型應用電路
評估模塊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.
評估模塊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
圖3.評估模塊DRV8876x/74xEVM外形圖(單個H橋馬達驅動器)
圖4.評估模塊DRV8876x/74xEVM PCB裝配面3D圖
圖5.評估模塊DRV8876x/74xEVM電路圖:MD014B(002)
圖6.評估模塊DRV8876x/74xEVM電路圖:MD014B(002)
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