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參數(shù)資料
| 型號： | TMC249A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High Current Microstep Stepper Motor Driver with sensorless stall detection, protection / diagnostics and SPI Interface |
| 中文描述： | 大電流微步步進電機驅(qū)動器，帶有傳感器的失速檢測，保護/診斷和SPI接口 |
| 文件頁數(shù)： | 16/25頁 |
| 文件大?。?/td> | 219K |
| 代理商： | TMC249A |
TMC249 / TMC249A DATA SHEET (V2.02 / Aug 12th, 2005)
16
Copyright 2005, TRINAMIC Motion Control GmbH & Co KG
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
0.15
0.10
I
max
723mA
1030mA
1545mA
2267mA
3400mA
High side overcurrent detection resistor R
SH
The TMC249 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.
Attention
: A careful PCB layout is required for the sense resistor traces and for the R
SH
traces.
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| TMC249-A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:High Current Microstep Stepper Motor Driver with Sensorless Stall D e t e c t i o n ,P rotection / Diagnosis and SPI Interface |
| TMC249A-LA | 制造商:Trinamic 功能描述:IC BRIDGE DRIVER SPI/ANLG 32QFN |
| TMC249A-SA | 制造商:Trinamic 功能描述:STEPPER MOTOR DRIVER SMD SO-28 制造商:Trinamic 功能描述:STEPPER MOTOR DRIVER, SMD, SO-28 制造商:Trinamic 功能描述:IC MOTOR DRIVER, FULL BRIDGE, 1mA SOIC-28; Motor Type:Full Bridge; No. of Outputs:8; Output Current:1mA; Output Voltage:34V; Driver Case Style:SOIC; No. of Pins:28; Supply Voltage Min:3V; Supply Voltage Max:5.5V; MSL:MSL 2 - 1 year ;RoHS Compliant: Yes |
| TMC249-EVAL | 制造商:Trinamic 功能描述:EVALUATION BOARD FOR TMC249 |
| TMC249-HVHR | 制造商:TRINAMIC 制造商全稱:TRINAMIC 功能描述:Evaluation Board for TMC249 with High Voltage and High Resolution |
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