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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)： | 12/31頁 |
| 文件大?。?/td> | 324K |
| 代理商： | L6238S |
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If zero crossings are detected, the sequencer will
automaticallylock on to the proper phase.
This resynchronization will take effect with the
motor speed running as low as typically 30% of
it’s nominal value.
2.5 External Sequencing
Although the user-defined Start-Up Algorithm is
flexible and will consistently spin up a motor with
no external interaction, the possibility exists
where certain applications mightrequire complete
microprocessor control of start-up.
The L6238S offers this capability via the
SE-
QUENCE INCREMENT
input. Referring to figure
2-5, during initial power-up with
Output Enable
low, the controller is in the ”Hold and Wait for De-
cision” state. If the
SEQUENCE INCREMENT
pin
is brought high during this state, the Auto StartUp
Algorithm is disabled and the sequencer can be
controlledexternally.
When
Output
Enable and Run/Brake
brought high, the sequencer is incremented on
each positive transition o the
SEQUENCER IN-
are
CREMENT
pin. During the time that this pin is
high, all Bemf information is masked out. When it
is low, the Bemf information can be detected nor-
mally after the internal mask time. The minimum
mask time is 192/Sys_Clk (i.e. with Sys_Clk =
10MHz, min. mask = 19.2
μ
s) Therefore to insure
that the sequencer is under complete control of
the state machine, the time that the
SEQUENCE
INCREMENT
pin is held low should be much less
then the min. mask time, but greater then1
μ
s.
When the motor has reached a predetermined
speed, the
SEQUENCE INCREMENT
pin can be
left low and the L6238S Motor Control logic will
take over and automatically spin up the motor to
the desiredspeed
.
3.0 START-UP ALGORITHMS
3.1 Spin-UpOperation
The spinoperation can be separatedinto 3 parts:
1)
Open Loop Start-Up
- The object is to create
motion in the desired direction so that the Bemf
voltages at the 3 motor terminals can provide reli-
able information enabling a transition to closed
loop operation.
STATE=1
DRIVERS OFF
MIN CLOCK DELAY
PERIOD STOP
MASK STOP
INT START-UP DISABLED
MIN CLOCK DELAY
LOAD MIN DELAY
LOAD MIN MASK
MASK COUNT
SEQINC=1 &
OUTENA=0
RUN/BRK=X
D95IN313
*VALID IF SEQINC=0, AND DELAY TIMES OUT
**CLOCK DELAY=F(TDLY_[2:0])
WHEN BEMF PERIOD <3.3ms @ 10MHz (SPEED >12.7Hz FOR 8 POLES)
SEQINC=0
STATE=STATE+1
MASK COUNT
LOAD DELAY=PERIOD
LOAD MASK=PERIOD
RESET PERIOD
PERIOD COUNT
DELAY COUNT**
BEMF
POR=0
FROM ANY STATE
DRIVERS ON
PERIOD COUNT
DELAY COUNT
SEQINC=0
BEMF
SEQINC=1
STATE=STATE+1
SEQINC=1
FROM ANY STATE
WITH SEQ_INC=0
RETURN TO
PREVIOUS STATE
(CHANGING SEQINC=1)
RUN/BRK=1 &
OUTENA=1
SEQINC=1
Figure 2-5
L6238S
12/31
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) |
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