TOSHIBA Bi-CMOS Integrated Circuit Silicon Monolithic 东芝Bi-CMOS集成电路硅单片
TB6588FG
PWM Sensorless Driver for 3-Phase Full-Wave BLDC Motors 无刷无霍尔电机三相全波驱动器 The TB6588FG provides sensorless commutation and PWM current control for 3-phase full-wave BLDC motors. It controls rotation speed by changing a PWM duty cycle by analog voltage. （tb6588fg可实现无位置传感器换相及PWM三相全波直流无刷电机的电流控制。它通过模拟电压改变脉宽调制占空比来控制旋转速度。）
Features 功能
3-phase full-wave sensorless drive （三相全波无传感器驱动） PWM chopper drive （PWM斩波驱动） PWM duty cycle control by analog input (7-bit AD converter) （通过模拟量输入控制 PWM占空比（7位AD转换器））
Output current: Iout A (max), A (typ.) （输出电流：电流输出（最大），（典型）） Overcurrent protection 过电流保护 Forward/reverse rotation 正向/反向旋转
Lead angle control (00, , 150 and 300) 超前角控制（00 ， , 150,和300） Overlap commutation 重叠换相 Rotation speed detecting signal 转速检测信号
DC excitation mode to improve startup characteristic 直流励磁方式改善启动特性 Adjustable DC excitation time and forced commutation time for startup operation
可调直流励磁时间和启动操作的强制换向时间
Forced commutation frequency control capability (fosc/(6x216 ), fosc/(6x217 ), fosc /(6x218), fosc /(6x219 )
强制换向频率控制功能(fosc/(6x216 ), fosc/(6x217 ), fosc /(6x218), fosc /(6x219 )
Pin Description引脚描述 Pin No引脚号 Symbol 符号 SGND SC I/O进/出 — | Description描述 Signal ground pin 信号地引脚 Connection pin for a capacitor to set a startup commutation time and ramp-up period during duty-cycle operation 用于占空比操作期间设置启动换向时间和斜坡上升时间的电容连接引脚 FPWM | PWM frequency select input (This pin has a pull-down resistor.) PWM PWM频率选择输入引脚（有下拉电阻） High : fPWM=fosc /128 高电平 ：fPWM=fosc /128 Low,open : fPWM= fosc /256 低电平或开路：fPWM= fosc /256 FMAX | Set an upper limit of the maximum commutation frequency. (This pin has a pull-up resistor.) 设置最大换相频率上限（有上拉电阻） High, Open : Maximum commutation frequency fMAX=fOsc/(6x28 ) Low : Maximum commutation frequency fMAX=fOsc/(6x29 ) VSP | Duty cycle/motor speed control input (This pin has a pull-up resistor.) 占空比/电机速度控制输入引脚（有下拉电阻） 0
Upon receiving an analog voltage signal input for startup, the rotor is aligned to a known position in DC excitation mode, and then the rotation is started in forced commutation mode by applying a PWM signal to the motor. As the rotor moves, the back-EMF is acquired in each phase of the coil. 在接收到启动电压信号后，转子在直流励磁模式下对准一个已知位置，然后通过施加一个PWM信号，在强制换向模式下旋转电机。在转子的转动的同时获取在每相线圈的反电动势。
When a signal indicating the polarity of each phase terminal voltages including back-EMF is applied to the position signal input, automatic switching occurs from the forced commutation PWM signal to the normal commutation PWM signal based on the position signal input (detected back-EMF) to drive a BLDC motor in sensorless mode.
当一个信号，表明每个相终端电压的极性，包括反电动势被施加到位置信号输入，自动切换发生从强制换向的脉宽调制信号到正常基于位置信号输入整流PWM信号（检测反电动势）来驱动无刷直流电机在无传感器模式。
2. Startup operation 启动运行
At startup, there is no back-EMF due to the stationary motor, and the motor position cannot be detected in sensorless mode. To avoid this, the TB6588FG rotor is first aligned to a known position in DC excitation mode for a certain period of time, and then the motor is started in forced commutation mode. Each period of DC excitation and forced commutation drives is set with an external capacitor. These time settings vary depending on the motor type and motor loading, so that they should be adjusted experimentally.
在启动时，没有反电动势，在无传感器模式下电机的位置不能检测到。为了避免这种情况，在一定的时间内利用DC激励转子对齐一个已知的位置，然后电机启动，强制换向。直流励磁时间和强制换向时间都由一个外部电容设定。根据电机的类型和电机的负载不同设定时间也不同，通过进行实验进行调整。
The rotor is aligned to a certain position specified in DC excitation mode for the period of (a), during which the IP pin voltage decreases from VREF to VREF/2 level. The time constant for the period is determined by C and R . After that, operation mode is switched to forced commutation mode (b) as shown above. The duty cycles for DC excitation and forced commutation modes are determined according to the SC pin voltage. When the rotational frequency exceeds the forced commutation frequency specified with the status of the FST pins, the operation mode is switched to the sensorless mode. The duty cycle for sensorless mode is determined by the VSP value. 在IP引脚电压从VREF降低至VREF / 2期间，在阶段（a）转子在直流励磁模式下对准某一指定的位置。这个相关时间常数是由C和R确定的。之后，操作模式切换到强制换向模式（b）如上所示。直流励磁和强制换向模式的占空比根据引脚SC的电压确定。当转动频率超过FST引脚状态指定的强制换向频率后，运行模式切换到无传感器运行模式。无传感器模式的PWM占空比是由VSP电压值设定。
3. Operating delay under rotational speed control 转速控制模式下的操作延时
Rotation speed of the motor, including rotation startup and stop, is controled by applying the speed command voltage to the VSP pin. However, the operation of the device is actually determined by applied voltage to the SC pin. The voltage on the SC pin is the charging voltage of a capacitor C, which is determined by the charging/discharging time of C. This induces an operating delay. When the applied voltage on the VSP pin is varied from 1 to 4V, the operating delay occurs as shown below.
电机的转速，包括启动和停止，通过应用速度指令电压的VSP引脚控制。然而，实际上的操作是由SC引脚的电压确定的。SC引脚的电压是电容C电压，它受C充电/放电时间影响导致反应延迟。当在VSP引脚施加的电压从1～4V变化时，反应延迟如下图所示。
Charging time of C1 (when accelerating): TUP (typ.)=C1x(VSPU- VSPL)/ (s) c1的充电时间 Discharging time of C1 (when decelerating): TDOWN (typ.)=C1x(VSPU-VSPL)/36uA (s) 放电时间
Note: When the motor is stopped (VSP<1 V), the SC pin capacitor C is instantly discharged. (Discharging time of
C1 is the time C1 is discharged through 2 kΩ (typ) to GND)
注意：当电机停止时(VSP<1 V),SC引脚电容C会立即放电（放电时间是由一个2K电阻对地）
4. Forced commutation frequency 强制换相频率
The forced commutation frequency at startup is set as follows. 启动时强制换相频率如下设置
The optimal frequency varies depending on the motor type and motor loading, so that they must be adjusted experimentally. 最佳频率取决于电机类型和负载，因此，必须进行实验调整。
The forced commutation frequency is determined by the value of external capacitor and resistor, and also the logic level of FST1 and FST2 pins (These pins have pull-down resistors). 强制换相频率由外部振荡电阻及电容确定，同样也与FST1和FST2引脚的设置有关（这俩引脚已下拉） FST2: FST1=High : High=Forced commutation frequency fST=f osc /(6x216 ) FST2: FST1=High : Low, Open=Forced commutation frequency fST=f osc /(6x217 ) FST2: FST1=Low, Open : High=Forced commutation frequency fST=f osc /(6x218 ) FST2: FST1=Low, Open:Low,Open=Forced commutation frequency fST=f osc /(6x219 )
frequency PWM的频率
The PWM frequency is determined by the value of external capacitor and resistor, and the logic level of the FPWM pin (This pin has a pull-down resistor).
PWM的频率取决于外部振荡电容和电阻，以及FPWM引脚的设置 （该引脚已下拉） High : fPWM=fosc /128 Low,open : fPWM= fosc /256
The PWM frequency must be sufficiently high, compared to the electrical frequency of the motor. It also must be within the allowable range of switching performance of the driver circuit.
PWM的频率相对于电机的频率必须足够高，当然，也必须在驱动电路允许的范围之内
6. Speed control pin (VSP) 速度控制引脚
An analog voltage applied to the VSP pin is converted by a 7-bit AD converter to control the duty cycle of the PWM.这个模拟电压通过一个7位的AD转换器去控制PWM的占空比
0 7. Fault protection operation 故障保护设置
TB6588FG中文资料
