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参数资料
| 型号： | L6470PD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 7 A, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 22/61页 |
| 文件大小： | 703K |
| 代理商： | L6470PD |
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L6470
Phase current control
Doc ID 16737 Rev 1
29/61
7
Phase current control
L6470 controls the phase current applying a sinusoidal voltage to motor windings
(Figure 12). Phase current amplitude is not directly controlled but depends on phase voltage
amplitude, load torque, motor electrical characteristics and rotation speed. Sinewave
amplitude is proportional to the motor supply voltage multiplied by a coefficient (KVAL). KVAL
ranges from 0 to 100% and the sinewave amplitude can be obtained through the following
formula:
Equation 1
Different KVAL values can be programmed for acceleration, deceleration and constant speed
phases and when motor is stopped (HOLD phase) through KVAL_ACC, KVAL_DEC,
KVAL_RUN and KVAL_HOLD registers (see paragraph 9.1.10).
L6470 offers various methods to guarantee a stable current value, allowing the
compensation of:
●
back electromotive force value (see paragraph 7.3);
●
motor supply voltage variation (see paragraph 7.4);
●
windings resistance variation (see paragraph 7.5).
7.1
PWM sinewave generators
Two voltage sinewaves applied to stepper motor phases are generated by two PWM
modulators.
PWM frequency (fPWM) is proportional to the oscillator frequency (fOSC) and can be
obtained through the following formula:
Equation 2
'N' is the integer division factor and 'm' is the multiplication factor. 'N' and 'm' values can be
programmed by F_PWM_INT and F_PWM_DEC parameters in CONFIG register (see
7.2
Sensorless stall detection
Depending on motor speed and load angle characteristics, L6470 offers a motor stall
condition detection using a programmable current comparator.
When a stall event occurs, the respective flag (STEP_LOSS_A or STEP_LOSS_B) is forced
low until a GetStaus command or a system reset occurs (see paragraph 9.2.18).
VAL
S
OUT
K
V
=
m
N
512
f
OSC
PWM
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6470PDTR | 功能描述:马达/运动/点火控制器和驱动器 dSPIN 7.0A 8 - 45 V DMOS Motor Driver RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L64710GC-30 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Encoder/Decoder |
| L64710GC-40 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Encoder/Decoder |
| L64710GM-25 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Encoder/Decoder |
| L64710GM-30 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Encoder/Decoder |
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