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參數(shù)資料
| 型號(hào)： | TMC239-LA |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High Current Microstep Stepper Motor Driver with protection / diagnosis and SPI Interface |
| 中文描述： | 大電流微步驅(qū)動(dòng)器，步進(jìn)電機(jī)保護(hù)/診斷和SPI接口 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大小： | 170K |
| 代理商： | TMC239-LA |
TMC239 DATA SHEET (V1.00 / Apr. 24th, 2003)
13
Copyright 2002, TRINAMIC Microchips GmbH
Calculation of the external components
Sense resistor
Choose an appropriate sense resistor (R
S
) to set the desired motor current. The maximum motor
current is reached, when the coil current setting is programmed to “1111”. This results in a current
sense trip voltage of 0.34V when the internal reference or a reference voltage of 2V is used.
When operating your motor in fullstep mode, the maximum motor current is as specified by the
manufacturer. When operating in sinestep mode, multiply this value by 1.41 for the maximum current
(I
max
).
R
S
= V
TRIP
/ I
max
In a typical application:
R
S
= 0.34V / I
max
R
S
:
Current sense resistor of bridge A, B
V
TRIP
:
Programmed trip voltage of the current sense comparators
I
max
:
Desired maximum coil current
Examples for sense resistor settings
R
S
0.47
0.33
0.22
I
max
723mA
1030mA
1545mA
High side overcurrent detection resistor R
SH
The TMC239 detects an overcurrent to ground, when the voltage between VS and VT exceeds 150mV.
The high side overcurrent detection resistor should be chosen in a way that 100mV voltage drop are
not exceeded between VS and VT, when both coils draw the maximum current. In a sinestep
application, this is when sine and cosine wave have their highest sum, i.e. at 45 degrees,
corresponding to 1.41 times the maximum current setting for one coil. In a fullstep application this is
the double coil current.
In a microstep application:
R
SH
= 0.1V / (1.41
×
I
max
)
In a fullstep application:
R
SH
= 0.1V / (2
×
I
max
)
R
SH
:
High side overcurrent detection resistor
I
max
:
Maximum coil current
However, if the user desires to use higher resistance values, a voltage divider in the range of 10
to
100
can be used for VT. This might also be desired to limit the peak short to GND current, as
described in the following chapter.
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