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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)： | 12/35頁 |
| 文件大?。?/td> | 383K |
| 代理商： | L6238 |
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masked out, and when it is low, the Bemfinforma-
tion can be detected normally. When the motor
has reached a predetermined speed, the SE-
QUENCE INCREMENT pin can be left low and
the L6238 Motor Control logic will take over and
automaticallybring the motor into PhaseLock.
3,0 START-UP ALGORITHMS
3.1 Spin-Up Operation
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
voltagesat the 3 motor terminals can provide reli-
able information enabling a transition to closed
loop operation.
2)
Closed Loop Start-Up
- The Bemf voltage
zerocrossings provide timing information so that
the motor can be accelerated to steady state
speed.
3)
Steady-State Operation
- The Bemf voltage
zero-crossings provide timing information for pre-
cision speedcontrol.
The L6238 contains features that offer flexible
control over the start-up procedure. Either the on-
board Auto-Start Algorithm can be used to control
the start-up sequence or more sophisticatedexte-
mal start-up algorithms can be developed using
the Serial Port and key control/sense functions
brought out to pins.
3.2 Auto-Start Algorithm
The Serial Port Control Bit Auto/Ext(Refer to Ta-
ble 2), controls the start-up mode. The power up
default state is a logic high which selects the
AutoStart Mode. When
Run/Brake
is low, the
L6238 is in brake mode, and the Auto-Start Algo-
rithm is reset. In the brake mode, all of the lower
DMOS drivers are ON, and the upper drivers are
OFF.
Note that
Run/Brake
should be brought low for a
period exceeding the value selected for the brake
delay time in order to initialize the brake delay cir-
cuit.
The Auto-Start Algorithm is based on an Align &
Goapproach and can be visualized by referring to
Figure 9. Shown are the Output
Enable and
Run/Brake
control signals, sequenceroutput with
the resultant output phases, and the Align and Go
status bits. The times labeled Tl and T2 are two
Figure9:
AutoStart Profile
T
asd
<1>
0
0
1
1
T
asd
<0>
0
1
0
1
T
a
= T
1
0.178 s
0.356 s
0.533 s
0.711 s
T
2
T
g
0.533 s
1.067 s
1.600 s
2.133 s
0.711 s
1.422 s
2.133 s
2.844 s
Note: PLL ReferenceFrequency =90Hz
L6238
12/35
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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