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參數(shù)資料
| 型號： | L6238SQA |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| 中文描述： | 12V的無傳感器主軸電機控制器 |
| 文件頁數(shù)： | 17/31頁 |
| 文件大?。?/td> | 324K |
| 代理商： | L6238SQA |
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4.3 Charge Pump
The charge pump circuitry is used as a means of
doubling the analog supply voltage in order to al-
low the upper N-channel DMOS transistors to be
driven like P-channel devices. The energy stored
in the reservoir capacitor is also used to drive the
lower drivers in a brake mode if the analog supply
is lost. Figure 4-3 is a simplified schematiocof the
charge pump circuitry.
A capacitor, C
pump
, is used to retrieve energy
from the analog supply and then ”pumps” it into
the storage capacitor,C
resvr
.
An internal 300KHz oscillator first turns ON Q2 to
quickly charge C
pump
to approximately the rail
voltage. The oscillator then turns ON Q1 while
turning OFF Q2. Since the bottom plate of C
pump
,
is now effectivelyat the rail voltagevia D2.
A zener-referencedseries-pass regulator supplies
Figure 4-3
I1
Islew
V
PUMP
SW2
1
0
Cfet
UPPER A
+
-A2
VCTRL
X4
A3
VPOWER
I2
Islew
SW3
1
0
Cfet
OUTPUT
B
C
OUTA
L1
L2
L3
Q1
Q2
R
S
3.1V
SLEW RATE
REFERENCE CURRENT
Q3
Q4
Q5
R
SLW
RSENSE
CSA
PWM SLEW/RC
LOWER A
D95IN315
VANALOG
Figure 4-4
L6238S
17/31
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: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) |
| L624 | 制造商:CRYDOM 制造商全稱:Crydom Inc., 功能描述:Power Modules |
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