基于LV8907无传感器三相无刷直流马达控制方案_技术

　　On Semi公司的LV8907是高性能AEC-Q100许可的无传感器三相无刷直流（BLDC）马达控制器，集成了用来驱动外接N-MOSFET的栅极驱动器，两级电荷泵提供各种低RDS（ON）外接N-MOSFET所需的栅极电压，工作结温高达175ºC，工作电压5.5V 到 20V，主要用在汽车泵（燃料泵，油泵和水泵），风扇（HVAC，散热器，电池冷却，LED头灯冷却）以及白色家电和工业BLDC马达控制。本文介绍了LV8907主要特性，框图，典型应用电路以及评估板LV8907UWGEVK主要特性，电路图和材料清单。

　　The LV8907 is a high performance， AEC-Q100 qualified， sensor-less three-phase BLDC motor controller with integrated gate drivers for driving external N-MOSFETs. An on-chip two-stage charge pump provides required gate voltage for a wide range of low RDS（ON） type external N-MOSFETs. The device offers a rich set of system protecTIon and diagnosTIc funcTIons such as over-current， over-voltage， short-circuit， under-voltage， over-temperature and many more. It supports open-loop as well as closed-loop speed control with user configurable startup， speed setTIng and proportional/integral （PI） control coefficients， making it suitable for a wide range of motor and load combinations. With a built-in linear regulator for powering external circuits， a watchdog timer， and a LIN （Local Interconnect Network） transceiver， the LV8907 offers a very small system solution. The LV8907 stores system parameters in embedded one-time programmable （OTP） non-volatile memory in addition to RAM system memory. An SPI interface is provided for parameter setting and monitoring the system status. With the operating junction temperature tolerance up to 175ºC and electrically LIN compatible control signals （PWM and Enable）， the LV8907 is an ideal solution for stand-alone BLDC motor control systems.

　　LV8907主要特性：

　　AEC-Q100 qualified and PPAP capable. 

　　Operating junction temperature up to 175ºC 

　　Operating voltage range from 5.5V to 20V with tolerance from 4.5V to 40V 

　　Embedded proprietary sensor-less trapezoidal and pseudo-sinusoidal commutation 

　　Supports open-loop as well as closed-loop speed control 

　　Integrated gate drivers for driving six N-MOSFETs 

　　Two-stage charge pump for continuous 100% duty cycle operation 

　　5V/3.3V regulator， LIN transceiver and Watchdog timer applications using an external microcontroller.

　　Configurable speed settings and PI control coefficients 

　　Various system protection features including：

　　Shoot through protection using configurable dead-time

　　Drain-source short detection

　　Cycle-by-cycle current limit and over-current shutdown

　　Over-voltage and under-voltage shutdown

　　Over-temperature warning and shutdown

　　Input PWM fault detection

　　LV8907典型应用：

　　Automotive pumps （Fuel， Oil， and Hydraulic） 

　　Fans （HVAC， Radiator， Battery Cooling， LED Headlight Cooling） 

　　White goods and industrial BLDC motor control

图1.LV8907框图

图2.LV8907单独使用配置图

　　图3.LV8907基于LIN的控制配置图

　　LV8907UW评估板LV8907UWGEVK

　　The LV8907UWGEVK Evaluation Kit v1.0 is designed to provide an easy and quick development platform for three phase sensor-less BLDC motor control applications using the LV8907UW. The LV8907UW is a stand-alone solution that does not need a microcontroller for operation. An Atmel microcontroller is included in the kit to communicate via USB with the PC based graphical user interface （GUI） and support some peripheral functions such as current and voltage measurement， and external temperature monitoring for easier system development. For quick-start and basic The kit consists of：

　　1. LV8907UW Evaluation Board （EVB）

　　2. USB cable Type A to mini B.

　　3. Graphical User Interface.

　　评估板LV8907UWGEVK主要特性：

　　• Motor operation： 7V to 20V （40V transient）。

　　• Max current： 30A.

　　• Maximum continuous power： 400W.