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| 型號： | TMC249-SA |
| 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)： | 15/25頁 |
| 文件大小： | 219K |
| 代理商： | TMC249-SA |
TMC249 / TMC249A DATA SHEET (V2.02 / Aug 12th, 2005)
15
Copyright 2005, TRINAMIC Motion Control GmbH & Co KG
Unipolar Operation
The TMC249 can also be used in an unipolar motor application with microstepping. In this
configuration, only the four upper power transistors are required.
Differences of short circuit behavior in unipolar operation mode
Since there is no possibility to disable a short to VS condition, the circuit is not completely short circuit
proof. In a low cost application a motor short would be covered, just using the bottom sense resistors
(see schematic).
Differences in chopper cycle in unipolar operation mode
In unipolar mode, one of the upper side transistors is chopped, depending on the phase polarity. Slow
decay mode always means, that both transistors are disabled. There is no difference between slow
and fast decay mode, and the mixed decay control bits are “don’t care”. The transistors have to stand
an off voltage, which is slightly higher than the double of the supply voltage. Voltage decay in the coil
can be adapted to the application by adding additional diodes and a zener diode to feed back coil
current in flyback conditions to the supply.
HA1
LA2
SRA
TMC249/
TMC239
HA2
P
P
LA1
+V
M
One coil of
the motor
R
S
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