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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)： | 14/24頁 |
| 文件大小： | 216K |
| 代理商： | L6258E |
L6258E
14/24
order to increment the total open loop gain increasing the bandwidth too.
4.4 Error Amplifier and Sense Amplifier
As explained before the gain of these two blocks is :
Bx
dB
= ACerr
dB
+ ACsense
dB
Being the voltage across the sense resistor the input of the Bx block and the error amplifier voltage the output
of the same, the voltage gain is given by :
Verr_out = -(ic · Zc) so ic = -(Verr_out ·
)
because ib = icwe have:
Vsense ·
= -(Verr_out ·
)
In the case of no external RC network is used to compensate the error amplifier, the typical open loop transfer
function of the error plus the sense amplifier is something with a gain around 80dB and a unity gain bandwidth
at 400kHz. In this case the situation of the total transfer function Aloop, given by the sum of the Ax
dB
and Bx
dB
is :
Figure 9.
The BODE diagram shows together the error amplifier open loop transfer function, the Ax function and the re-
sultant total Aloop given by the following equation :
Aloop
dB
= AxdB + Bx
dB
The total Aloop has an high DC gain of 78.1dB with a bandwidth of 15KHz, but the problem in this case is the
stability of the system; in fact the total Aloop cross the zero dB axis with a slope of -40dB/decade.
Now it is necessary to compensate the error amplifier in order to obtain a total Aloop with an high DC gain and
a large bandwidth. Aloop must have enough phase margin to guarantee the stability of the system.
A method to reach the stability of the system, using the RC network showed in the block diagram, is to cancel
the load pole with the zero given by the compensation of the error amplifier.
ib
Vsense Gs
Vsense
Rb
-------
=
=
Zc
------
Rb
-------
Zc
------
Bx
Vsense
------------------------
–
Rb
-------
–
=
=
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PDF描述 |
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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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