- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383236 > L6258E (意法半導體) PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER PDF資料下載
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(qū)動 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 216K |
| 代理商： | L6258E |
11/24
L6258E
4
PWM CURRENT CONTROL LOOP
4.1 Open Loop Transfer Function Analysis
Block diagram : refer to Fig. 6.
Table 7. Application data:
these data refer to a typical application, and will be used as an example during the analysis of the stability of the
current control loop.
The block diagram shows the schematics of the L6258E internal current control loop working in PWM mode; the
current into the load is a function of the input control voltage V
DAC
, and the relation between the two variables
is given by the following formula:
I
load
· R
S
· G
S
= V
DAC
· G
in
where:
V
DAC
G
in
G
s
R
s
In this configuration the input voltage is compared with the feedback voltage coming from the sense resistor,
then the difference between this two signals is amplified by the error amplifier in order to have an error signal
controlling the duty cycle of the output stage keeping the load current under control.
It is clear that to have a good performance of the current control loop, the error amplifier must have an high DC
gain and a large bandwidth .
Gain and bandwidth must be chosen depending on many parameters of the application, like the characteristics
of the load, power supply etc..., and most important is the stability of the system that must always be guaran-
teed.
To have a very flexible system and to have the possibility to adapt the system to any application, the error am-
plifier must be compensated using an RC network connected between the output and the negative input of the
same.
For the evaluation of the stability of the system, we have to consider the open loop gain of the current control
loop:
is the control voltage defining the load current value
is the gain of the input transconductance amplifier ( 1/Ra )
is the gain of the sense transconductance amplifier ( 1/Rb )
is the resistor connected in series to the output to sense the load current
V
S
= 24V
Gs transconductance gain = 1/Rb
L
L
= 12mH
Gin transconductance gain = 1/Ra
R
L
= 12
Ampl. of the Tria_0_180 ref. = 1.6V (peak to peak)
R
S
= 0.33
R
a
= 40K
R
C
= to be calculated
R
b
= 20K
C
C
= to be calculated
V
r
= Internal reference equal to V
DD
/2 (Typ. 2.5V)
I
LOAD
R
S
R
b
------
V
DAC
R
a
------
=
I
LOAD
V
DAC
R
R
a
R
s
------------------
0.5
V
R
S
--------------
A
( )
=
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6258EX | PWM CONTROLLED - HIGH CURRENT DMOS UNIVERSAL MOTOR DRIVER |
| L6260 | 4.5 - 5.5V DISK DRIVER SPINDLE & VCM, POWER & CONTROL COMBO’S |
| L6268 | 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO” |
| L6269 | 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL “COMBO” |
| L6270 | MILLI-ACTUATOR DRIVER |
相關(guān)代理商/技術(shù)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(qū)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。