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參數(shù)資料
| 型號： | L6258E |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER |
| 中文描述： | PWM控制-大電流DMOS的通用型電機驅動 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 216K |
| 代理商： | L6258E |
15/24
L6258E
The transfer function of the Bx block with the compensation on the error amplifier is :
In this case the Bx block has a DC gain equal to the open loop and equal to zero at a frequency given by the
following formula:
In order to cancel the pole of the load, the zero of the Bx block must be located at the same frequency of 163Hz;
so now we have to find a compromise between the resistor and the capacitor of the compensation network.
Considering that the resistor value defines the gain of the Bx block at the zero frequency, it is clear that this
parameter will influence the total bandwidth of the system because, annulling the load pole with the error am-
plifier zero, the slope of the total transfer function is -20dB/decade.
So the resistor value must be chosen in order to have an error amplifier gain enough to guarantee a desired
total bandwidth .
In our example we fix at 35dB the gain of the Bx block at zero frequency, so from the formula:
where: Rb = 20k
we have: Rc = 1.1M
Therefore we have the zero with a 163Hz the capacitor value :
Now we have to analyse how the new Aloop transfer function with a compensation network on the error amplifier
is.
The following bode diagram shows :
– the Ax function showing the position of the load pole
– the open loop transfer function of the Bx block
– the transfer function of the Bx with the RC compensation network on the error amplifier
– the total Aloop transfer function that is the sum of the Ax function plus the transfer function of the com-
pensated Bx block.
Bx
Rb
-------
–
Rc
----------------------------------------
j
Rb
------------------------
–
–
=
=
Fzero
2
π
Rc Cc
-------------------------------
=
Bx_gain
@ zero freq.
20
Rb
-------
log
=
Cc
2
π
Fzero Rc
----------------------------------------
6.28 163 1.1 10
6
–
-------------------------------------------------------
880pF
=
=
=
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PDF描述 |
|---|---|
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| L6268 | 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO” |
| L6269 | 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO” |
| L6270 | MILLI-ACTUATOR DRIVER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6258E_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PWM controlled high current DMOS universal motor driver |
| L6258EA | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PWM controlled high current DMOS universal motor driver |
| L6258EP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PWM controlled high current DMOS universal motor driver |
| L6258EP_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PWM controlled high current DMOS universal motor driver |
| L6258EX | 功能描述:馬達/運動/點火控制器和驅動器 1.5A Stepper Motor 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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