Q67000-A9103 SIEMENS [Siemens Semiconductor Group], Q67000-A9103 Datasheet - Page 5

• Manufacturer Part Number: Q67000-A9103
• Description: 2.5-A High Performance Smart Power Stepper-Motor Driver with Diagnostic Interface
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Application
Two TLE 5250 drivers are required to operate a bipolar stepping motor. To implement
full-step operation, a squarewave voltage with the required stepping frequency is applied
to the phase input of the upper driver, and the same squarewave voltage, but offset in
phase by 90 el, to the phase input of the lower driver. Motor-current limiting is produced
by a DC signal that is applied to both nominal-current inputs. In microstep operation the
nominal current tracks sinusoidally and synchronously with the required stepping
frequency. This produces a sinusoidal current in the motor windings to ensure very
smooth running and a high stepping frequency. If an instantaneous nominal value (sine
or cosine) is held on the second driver, it is possible to set a certain angle of rotation while
the motor is stationary. The motor current produced by this depends on nominal voltage
and sense resistance (normally 0.5 ), i.e.
The actual voltage should be thoroughly filtered for precise current regulation, especially
in microstep operation. So the actual input is accessible, and an RC element is
necessary between the Sense output and Actual input. The resistance R
correspond to the internal resistance of the nominal-current input-voltage source to
prevent additional voltage offset on the nominal/actual comparator.
Circuit Description
Outputs
Outputs Q1 and Q2 are fed by push-pull output stages. Four integrated free-wheeling
diodes referred to ground or the supply voltage protect the integrated circuit against
reverse voltages from an inductive load.
Enable and Phase
Outputs Q1 and Q2 can be disabled by a voltage V
sink transistors are enabled by V
The voltage on the Phase input determines the phase of the output current. Output Q1
acts as a sink for V
For output Q2 this is reversed: sink for V
The sink transistors are chopped. Low signal on the Enable pin plus a clock signal on the
Phase pin enable readout of the multiplexer.
Semiconductor Group
Ph
0.8 V and as a source for V
Inh
I
M
2 V.
V
Ph
=
5
V
---------------------- -
R
2 V and source for V
nom
S
V
Ph
Inh
of
2 V.
0.8 V on the Enable pin. The
Ph
0.8 V.
TLE 5250
1998-02-01
R
should