參數(shù)資料
型號： L6470PD
廠商： STMICROELECTRONICS
元件分類： 運動控制電子
英文描述： STEPPER MOTOR CONTROLLER, 7 A, PDSO36
封裝： ROHS COMPLIANT, SSOP-36
文件頁數(shù)： 22/61頁
文件大?。?/td> 703K
代理商： L6470PD
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
Available PWM frequencies are listed in paragraph 9.1.21 from Table 22 to Table 25.
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6470PDTR 功能描述:馬達/運動/點火控制器和驅(qū)動器 dSPIN 7.0A 8 - 45 V DMOS Motor Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
L64710GC-30 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Encoder/Decoder
L64710GC-40 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Encoder/Decoder
L64710GM-25 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Encoder/Decoder
L64710GM-30 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Encoder/Decoder
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