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參數(shù)資料
| 型號： | L6258E |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)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(jī)驅(qū)動 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 216K |
| 代理商： | L6258E |
17/24
L6258E
The formula defining the gain of the load considering the Bemf of the stepper motor becomes:
we can see that the Bemf influences only the gain of the load block and does not introduce any other additional
pole or zero, so from the stability point of view the effect of the Bemf of the motor is not critical because the
phase margin remains the same.
Practically the only effect of the Bemf is to limit the gain of the total Aloop with a consequent variation of the
bandwidth of the system.
5
A typical application circuit is shown in Fig.12.
Note: For avoid current spikes on falling edge of DISABLE a "DC feedback" would be added to the ERROR
Amplifier. (R1-R2 on Fig. 12).
APPLICATION INFORMATION
5.1 Interference
Due to the fact that the circuit operates with switch mode current regulation, to reduce the effect of the wiring
inductance a good capacitor (100nF) can be placed on the board near the package, between the power supply
line (pin 13,31) and the power ground (pin 1,36,18,19) to absorb the small amount of inductive energy.
It should be noted that this capacitor is usually required in addition to an electrolytic capacitor, that has poor
performance at the high frequencies, always located near the package, between power supply voltage (pin
13,31) and power ground (pin 1,36,18,19), just to have a current recirculation path during the fast current decay
or during the phase change.
The range value of this capacitor is between few
μ
F and 100
μ
F, and it must be chosen depending on application
parameters like the motor inductance and load current amplitude.
A decoupling capacitor of 100nF is suggested also between the logic supply and ground.
The EA_IN1 and EA_IN2 pins carry out high impedance lines and care must be taken to avoid coupled noise
on this signals. The suggestion is to put the components connected to this pins close to the L6258E, to surround
them with ground tracks and to keep as far as possible fast switching outputs of the device. Remember also an
1 Mohm resistor between EA_INx and EA_OUTx to avoid output current spike during supply startup/shutdown.
A non inductive resistor is the best way to implement the sensing. Whether this is not possible, some metal film
resistor of the same value can be paralleled.
The two inputs for the sensing of the winding motor current (SENSE_A & SENSE_B) should be connected di-
rectly on the sensing resistor Rs terminals, and the path lead between the Rs and the two sensing inputs should
be as short as possible.
ACload
Vout
---------------------
V
S
-----------------------------------------------------------
Bemf
–
(
)
R
R
S
-------+
V
S
=
=
Acload
V
---------–
Bemf
V
S
R
+
R
L
R
S
--------------------
=
ACload
dB
20
V
---------–
Bemf
V
S
R
+
R
L
R
S
--------------------
log
=
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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(dá)/運(yùn)動/點(diǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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