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參數(shù)資料
| 型號： | 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)： | 25/35頁 |
| 文件大小： | 383K |
| 代理商： | L6238 |
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actually exceeded the mask period and was de-
tected as a zero crossing. This resulted in im-
proper sequencing of the outputs relative to the
proper phases and caused the motor to spin
down.
If the application requires a slow rate of slew at
the output, an externalnetwork can be connected
as shown in figure 25. A resistor, Rl is selected to
achieve the desired slew rate when the system is
in phase lock. A second resistor, R2, in series
with a diode, Dl, is connectedbetween the
SLEW
RATE
pin, and the
LOCK
output. At start up, the
LOCK
output is low, and R2 is in parallel with Rl
resulting is a faster slew rate. When lock is
achieve, the
LOCK
output is high, and R2 is es-
sentiallydisconnectedfrom the circuit.
5.7 Ext PFET Driver
The power handling capabilities of the 3 phase
output stage can be extendedwith the addition of
a singleP-Channel FET.
Figure 26 shows the Ext FET connection and
demonstrates
how
the
senses the FETs presence. When the voltage at
the
Gate Drive
pin is
≥
0.7V, the output of com-
parator A3 goes high, removing the variable drive
Al from the internal FETs and connects them in-
stead to Vanalogvia the commutationswitches to
facilitate full conduction. The upper FETs drive
Figure26:
ExternalP-Fet.
L6238
automatically
paths are not shown for clarity. A3 also closes
SW2 allowing Al to linearly drive the external P-
ChannelFET Ql via inverter A2.
5.8Bemf Sensing
Since no Hall Effect Sensors are required, the
commutationinformation is derived from the Bemf
voltage zero-crossings of the undriven phase with
respect to the center tap. The Bemf comparator
and associatedsignal levels are depicted in figure
27. For reliable operation, the Bemf signal ampli-
tudeshould be a minimumof
±
60 mV to be prop-
erly detected. In order to provide for noise immu-
nity, internal hysteresis is incorporated in the
detection circuitry to prevent false zero crossing
detection.
Figure 25:
DualSlew Rate.
L6238
25/35
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相關(guān)代理商/技術(shù)參數(shù) |
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