- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383236 > L6238S (意法半導(dǎo)體) 12V Sensorless Spindle Motor Controller(主軸馬達(dá)控制器) PDF資料下載
參數(shù)資料
| 型號： | L6238S |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 12V Sensorless Spindle Motor Controller(主軸馬達(dá)控制器) |
| 中文描述： | 12V的傳感器主軸電機(jī)控制器（主軸馬達(dá)控制器） |
| 文件頁數(shù)： | 26/31頁 |
| 文件大?。?/td> | 324K |
| 代理商： | L6238S |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁當(dāng)前第26頁第27頁第28頁第29頁第30頁第31頁
sufficient
switching speed of the output drivers. At higher
frequencies the switching losses inherent in the
drivers start to negativeany of the power dissipa-
tion savings gained withPWM operation.
The current sense amplifier has a minimum slew
rate of 0.31V/
μ
s. With a worst case Motor peak
start-up current of 2.5A and Sense Resistor of
0.33, the resultant R
sense
voltage would be equal
to 825mV. With a minimum gain of 3.8V/V, the
CSA output voltage would have to slew to 3.14V.
Therefore it would require approximately 10
μ
s for
the output voltage to reach the required com-
manded level.
If an ON time were selected that was less than
this time, the motor current would overshoot the
desired level resulting in incorrect current control
possibly exceeding the output capabilities of the
drivers.
response,
commensurate
with
the
5.1.5 Noise Blanking
Referring to Figure 5-8, when operating with
lower levels of current (i.e. < 700mA, with Rsense
= 0.33
), the possibility exiss where the noise
due to output Turn-ON can exceed the Com-
manded Current Level causing prematire Turn-
OFF.
In order to provide noise immunity from this
switching noise, a blanking circuit automatically
rejects any signal appearing at the output of the
CSA for a 3
μ
s period.
Figure 5-9 is an additional block diagram of the
PWM control loop including the noise blanking cir-
cuit. The output of A3 goes high when ever the
voltage at the CSA input is more positive then the
Control Voltage.
This is the case when either the motor current or
the turn-ON transient has reached the com-
manded level. The output of A3 is gates by N11.
In order to provide a blankingperiod, Q1 is turned
Figure5-8
10
μ
s/DIV
Vrsense
D95IN325
1
3
μ
s BLANKING PULSE
COMMANDED
CURRENT LEVEL
C1
8pF
Q1
N6
N10
I1
5
μ
A
N1
DELAY
TO OUPUT
DRIVERS
N7
N8
N11
N9
N12
2.4V
SW1
A2
+
-
1.2V
A3
+
-
N4
N2
N3
CLK_BEMF
N5
I2
20
μ
A
Q2
X4
PWM/LIN
RUN/BRAKE
N12
Q3
PWM TIMER
C4
PWM COMP
VCONTROL
CSA INPUT
PWM_SLEW
C3
R1
D95IN326
Figure 5-9
L6238S
26/31
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6238 | Sensorless Spindle Motor Driver(無傳感器主軸電機(jī)驅(qū)動器) |
| L6239 | 12V Disk Drive Spindle Driver(12V磁盤驅(qū)動主軸驅(qū)動器) |
| L6242 | VOICE COIL MOTOR DRIVER |
| L6243 | VOICE COIL MOTOR DRIVER |
| L6243D | VOICE COIL MOTOR DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6238SQA | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| L6238SQT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| L6239 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| L623C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T) |
| L623F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。