- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄384585 > L6238SQA (意法半導(dǎo)體) 12V SENSORLESS SPINDLE MOTOR CONTROLLER PDF資料下載
參數(shù)資料
| 型號(hào)： | L6238SQA |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| 中文描述： | 12V的無(wú)傳感器主軸電機(jī)控制器 |
| 文件頁(yè)數(shù)： | 18/31頁(yè) |
| 文件大?。?/td> | 324K |
| 代理商： | L6238SQA |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)當(dāng)前第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)
a voltage,V
brake
, duringbrake mode.
The maximum capacitance specified for the Stor-
age Capacitor is 4.7
μ
F.For applications requiring
a larger value, an external diode should be con-
nected between Vanalog and the
pacitor to prevent excessive inrush current from
damaging the charge pump circuitry. A small
value resistor (i.e. 50W) may instead be inserted
in series with the Storage Capacitor to limit the in-
rushcurrent.
Storage Ca-
4.4 Linear Motor Current Control
The output current is controlled in a linear fashion
via a transconductanceloop. Referring to Figure
4-4 the sourcing FET of one phase is forced into
full conduction by connecting the gate to V
pump
,
while the sinking transistor of an appropriate
phase operates as a transconductance element.
To understand the current control loop, it will be
assumed that Q2 in figure 4-4 is enabled via SW3
by the sequencer.During a run condition,the cur-
rent in Q2 is monitored by a resistor R
s
connected
to the R
sense
input.
The resulting voltage that appears across R
s
is
amplified by a factor of four by A3 and is sent to
A2 where it is compared to the CurrentCommand
Signal. A2 provides sufficient drive to Q2 in order
to maintain the motor speed at the proper level as
commanded by the Speed Controller.
4.5 Transconductance Loop Stability
The RC network connected to the Compensation
pin provides for a single pole/zero compensation
scheme. The pole/zero compensation scheme.
The pole/zero locations are adjusted such that a
few dB of gain (typ. 20dB) remains in the tran-
sconductanceloop at frequencieshigher than the
zero.
The inductive characteristic of the load provides
the pole necessary for loop stability. Thus the
loop bandwidth is actually limited by the motor it-
self.
Figure 4-5 shows the complete transconductance
loop including compensation, plus the response.
The Bode plot depicts the normal way to achieve
stability in the loop. The pole andzero are used to
set a gain of 20dB at a higher frequency and the
pole of the motor cuts the gain to achieve stabil-
ity.
Loop instabilitymay be causedby two factors:
1)The motorpole is too close to thezero. Refer-
ring to figure 4.6, the zero is not able to dec-
rement the shiftof phase, and when the effect
of the pole is present, the phase shift may
reach 180
°
and the loop will oscillate. To rec-
tify this situation, the pole/zero must be
shifted at lower frequencies by increasing the
compensationcapacitor.
Figure 4-5
Figure4-6
Figure4-7
L6238S
18/31
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6238SQT | 12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| L6327 | 6 / 4 CHANNEL VOLTAGE SENSE GMR PREAMPLIFIER |
| L6332 | 6 / 4 CHANNEL VOLTAGE SENSE GMR PREAMPLIFIER |
| L6353D | SMART DRIVER FOR POWER MOS & IGBT |
| L6363 | PRML READ/WRITE CHANNEL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6238SQT | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| L6239 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述: |
| L623C | 制造商:未知廠家 制造商全稱(chēng):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(chēng):未知廠家 功能描述:THYRISTOR MODULE|BRIDGE|HALF-CNTLD|CA|280V V(RRM)|46A I(T) |
| L624 | 制造商:CRYDOM 制造商全稱(chēng):Crydom Inc., 功能描述:Power Modules |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。