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| CP8025 三相BLDC马达驱动器解决方案 |
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| 文章来源： 更新时间：2014/10/23 9:46:00 |
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Microchip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 μA.
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 μA Typical
- Standby Mode: < 200 μA
• 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 NMOS
MOSFETs:
- 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:
- 5V@30mA
- 12V@30mA
• 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:
- 6V–19V (MCP8025)
- 6V–28V (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 Microchip’s 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” source code (provided on the board web page)
图6. MCP8025 BLDC马达驱动评估板框图
图7. MCP8025 BLDC马达驱动评估板电路图
图8. MCP8025 BLDC马达驱动评估板PCB外形图
图9. MCP8025 BLDC马达驱动评估板PCB顶层走线图
MCP8025 BLDC马达驱动评估板材料清单:
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