Microchip CP8025三相BLDC马达驱动器解决方案.docx

Microchip CP8025三相BLDC马达驱动器解决方案关键字：马达驱动, BLDC马达,CP8025Microchip公司的CP8025/6是集成了功率模块,睡眠模式和LIN收发器的三相无刷DC(BLDC)马达驱动器,包括有能驱动三个外接NMOS/NMOS晶体管对的三个半桥驱动器,峰值输出电流在12V时为0.5A,具有击穿保护电路,过流保护和短路保护功能,睡眠模式电流5uA,待机模式小于200uA.本文介绍了MCP8025/6主要特性,框图和典型应用电路,以及MCP8025 三相BLDC马达驱动评估板主要特性,框图,电路图,PCB元件布局图和材料清单与PCB走线图.The MCP8025/6 devices are 3-phase brushless DC (BLDC) power modules containing three integrated half-bridge drivers capable of driving three external NMOS/NMOS transistor pairs. The three half-bridge drivers are capable of delivering a peak output current of 0.5A at 12V for driving high-side and low-side NMOS MOSFET transistors. The drivers have shoot-through, overcurrent and short-circuit protection. A Sleep Mode has been added to achieve a typical “key-off” quiescent current of 5 A.The MCP8025 device integrates a comparator, a buck voltage regulator, two LDO regulators, power monitoring comparators, an overtemperature sensor, a LIN transceiver, a zero-crossing detector, a neutral simulator and an operational amplifier for motor current monitoring. The phase comparator and multiplexer allow for hardware commutation detection. The neutral simulator allows commutation detection without a neutral tap in the motor. The buck converter is capable of delivering 750 mW of power for powering a companion microcontroller. The buck regulator may be disabled if not used. The on-board 5V and 12V lowdropout voltage regulators are capable of delivering 30 mA of current.The MCP8026 replaces the LIN transceiver, neutral simulator and zero-crossing detector in MCP8025 with two level shifters and two additional op amps.The MCP8025/6 operation is specified over a temperature range of -40 to +150.Package options include 40-lead 5x5 QFN and 48-lead 7x7 TQFP with Exposed Pad (EP).MCP8025/6主要特性: AEC-Q100 Grade 0 Qualified Quiescent Current:- Sleep Mode: 5 A Typical- Standby Mode: 200 A LIN Transceiver Interface (MCP8025):- Compliant with LIN Bus Specifications 1.3, 2.2, and SAE J2602- Supports baud rates up to 20K baud- Internal pull-up resistor and diode- Protected against ground shorts- Protected against loss of ground- Automatic thermal shutdown- LIN Bus dominant timeout Three Half-Bridge Drivers Configured to Drive External High-Side NMOS and Low-Side NMOSMOSFETs:- Independent input control for high-side NMOS and low-side NMOS MOSFETs- Peak output current: 0.5A 12V- Shoot-through protection- Overcurrent and short circuit protection Adjustable Output Buck Regulator (750 mW) Fixed Output Linear Regulators:- 5V30mA- 12V30mA Operational Amplifiers:- one in MCP8025- three in MCP8026 Overcurrent Comparator with DAC Reference Phase Comparator With Multiplexer (MCP8025) Neutral Simulator (MCP8025) Level Translators (MCP8026) Input Voltage Range: 6V 40V Operational Voltage Range:- 6V19V (MCP8025)- 6V28V (MCP8026) Buck Regulator Undervoltage Lockout: 4.0V Undervoltage Lockout (UVLO): 5.5V (except Buck) Overvoltage Lockout (OVLO)- 20V (MCP8025)- 32V (MCP8026) Transient (100 ms) Voltage Tolerance: 48V Extended Temperature Range (TA): -40 to +150 Thermal Shutdown图1. MCP8025功能框图图2. MCP8026功能框图图3. MCP8025典型应用电路图图4. MCP8026典型应用电路图MCP8025 BLDC马达驱动评估板The MCP8025 TQFP BLDC Motor Driver Evaluation Board demonstrates Microchips 3-Phase Brushless DC (BLDC) Motor Gate Driver with Power Module, MCP8025, used in a BLDC motor drive application. When used in conjunction with a microcontroller, the MCP8025 will provide the necessary drive signals to drive for a 3-Phase BLDC motor. The MCP8025 contains the high-side and low-side drivers for external N-channel MOSFETs. A dsPIC33EP256MC504 processor is used to supply the PWM inputs to the MCP8025 as well as handle the high-speed Analog-To-Digital Conversion (ADC) required for 50 kHz PWM operation. The MCP8025 UART interface is used to configure the MCP8025 device and to send fault information to the dsPIC DSC controller. The evaluation board firmware uses a 6-step trapezoidal drive control algorithm to demonstrate the MCP8025 capabilities.图5. MCP8025 BLDC马达驱动评估板外形图MCP8025 BLDC马达驱动评估板主要特性: Input Operating Voltage Range: +6.0V to +19V Pre-programmed dsPIC33EP256MC504 Drives up to a 15A BLDC motor ON/OFF momentary contact switch Reset momentary contact switch Spare user-programmable momentary contact switch PWM signal LED indicators PICkit 3 and MPLAB ICD 3 debugger interfaces Speed control potentiometer Terminal block for 5V and 12V Hall-effect sensors LIN terminal block for user communications use Configurable external MOSFET overcurrent protection Configurable PWM dead-time protection Configurable PWM blanking time for current switching spikes Complete “C” sourc