Microchip MCP8025三相BLDC马达驱动方案

Microchip MCP8025三相BLDC马达驱动方案

Microchip公司的MCP8025/6是三相无刷DC(BLDC)马达栅极驱动器,包括有三个能驱动三个外接NMOS/NMOS晶体管对的半桥驱动器,在12V时可提供0.5A的峰值输出电流.器件集成了比较器,降压稳压器,两个LDO稳压器,电源监测比较器,超温传感器,LIN收发器,零交叉检测器,中性模拟器和运算放大器.主要用在汽车燃料泵,水泵和通风马达,家用电器,PMSM控制,业余爱好飞机,船和卡车.本文介绍了MCP8025/6主要特性,框图和典型应用电路,以及MCP8025 TQFP BLDC马达驱动评估板主要特性,框图,电路图,材料清单和PCB设计图.

The MCP8025/6 devices are 3-phase brushless DC(BLDC) power modules containing three integratedhalf-bridge drivers capable of driving three externalNMOS/NMOS transistor pairs. The three half-bridgedrivers are capable of delivering a peak output currentof 0.5A at 12V for driving high-side and low-side NMOSMOSFET transistors. The drivers have shoot-through,overcurrent and short-circuit protection. A Sleep Modehas been added to achieve a typical “key-off” quiescentcurrent of 5 μA.

The MCP8025 device integrates a comparator, a buckvoltage regulator, two LDO regulators, powermonitoring comparators, an overtemperature sensor, aLIN transceiver, a zero-crossing detector, a neutralsimulator and an operational amplifier for motor current monitoring. The phase comparator and multiplexerallow for hardware commutation detection. The neutralsimulator allows commutation detection without aneutral tap in the motor. The buck converter is capableof delivering 750 mW of power for powering acompanion microcontroller. The buck regulator may bedisabled if not used. The on-board 5V and 12V lowdropoutvoltage regulators are capable of delivering30 mA of current.

The MCP8026 replaces the LIN transceiver, neutralsimulator and zero-crossing detector in MCP8025 withtwo level shifters and two additional op amps.

The MCP8025/6 operation is specified over atemperature range of -40℃ to

+150℃.Package options include 40-lead 5x5 QFN and 48-lead7x7 TQFP with Exposed Pad (EP).

MCP8025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 DriveExternal High-Side NMOS and Low-Side NMOSMOSFETs:

- Independent input control for high-sideNMOS 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: - email protected - email protected ? 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

MCP8025应用:

? Automotive Fuel, Water, Ventilation Motors ? Home Appliances

? Permanent Magnet Synchronous Motor (PMSM)Control ? Hobby Aircraft, Boats, Vehicles

图1.MCP8025功能框图