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參數(shù)資料
| 型號(hào)： | L6238 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Sensorless Spindle Motor Driver(無傳感器主軸電機(jī)驅(qū)動(dòng)器) |
| 中文描述： | 傳感器主軸電機(jī)驅(qū)動(dòng)器（無傳感器主軸電機(jī)驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 20/35頁 |
| 文件大小： | 383K |
| 代理商： | L6238 |
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torque. The spin sense waveformat the bottomof
the figure indicates that this output signal toggles
with each zero crossing.
5.2 Brake Delay
When
Run/Brake
is brought low, a brake is initi-
ated. Referring to figure 16, SWI is opened and
the brake delay capacitor, C
brake
, is allowed to
discharge towards ground via R
brake
. At the same
time, switches SW2 through SW7 bring the gates
of the output FETs to ground halting conduction,
causing the motor to coast. While the motor is
coasting, the Bemf is used to park the heads.
When C
brake
reaches a voltage that is below the
turn ON threshold of Q I, Switches SW8, 9 and 10
bring the gates of the lower drivers to V
brake
po-
tential. This enables the lower FETs causing a
braking action. This braking action also occurs if
the logic supply is lost. The analog supply is not
monitored in the L6238 since the L6243 already
monitors this voltage and initiates a Park function
when this supply drops to apredeterminedlevel.
If multiple logic supplies are used in the applica-
tion, all logic signals to the L6238 including the
reference and clock signals should be buffered
with gates powered by the same supply as the
L6238 in order to prevent erroneous operation.
This would occur, for example, if the 5V supply to
the controller were lost while 5V were still present
at one of the logic pins. This would partially power
the chip, causingunpredictableoperation.
5.3 Charge Pump
The charge pump circuitry is used as a means of
doublingthe 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
Figure16:
BrakeDelay.
L6238
20/35
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|---|---|
| L6239 | 12V Disk Drive Spindle Driver(12V磁盤驅(qū)動(dòng)主軸驅(qū)動(dòng)器) |
| L6242 | VOICE COIL MOTOR DRIVER |
| L6243 | VOICE COIL MOTOR DRIVER |
| L6243D | VOICE COIL MOTOR DRIVER |
| L6243DS | VOICE COIL MOTOR DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6238S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:12V SENSORLESS SPINDLE MOTOR CONTROLLER |
| 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) |
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