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GS-D200 Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer GS-D200
Beschreibung 2/2.5A BIPOLAR STEPPER MOTOR DRIVE MODULES
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 17 Seiten
GS-D200 Datasheet, Funktion
GS-D200
GS-D200S
2/2.5A BIPOLAR STEPPER MOTOR DRIVE MODULES
FEATURES
Wide supply voltage range
Full/Half step drive capability
Logic signals TTL/CMOS compatible
Programmable motor phase current and chopper
frequency
Selectable Slow/Fast current decay
Synchronization for multimotor applications
Remote shut-down
Home position indication
DESCRIPTION
The GS-D200 and the GS-D200S are drive mod-
ules that directly interface a microprocessor to a two
phase, bipolar, permanent magnet stepper motors.
The phase current is chopper controlled, and the
internal phase sequence generation reduces the
burden of the controller and it simplifies software
development.
The GS-D200 uses bipolar power outputs while the
GS-D200S has powermos outputs to significantly
reduce both commutation and conduction losses.
A further benefit offered by the GS-D200S is the
complete protection of the outputs against any type
of shorts.
SELECTION CHART
Type
Ordering
Number
GS-D200
GS-D200S
Phase
Current
(A)
1.0 nom.
(0.5 to 2.0)
2.0 nom.
(0.5 to 2.5)
Voltage
Drop
(V)
4.1 max.
2.5 max.
Supply
Voltage
(V)
10 to 46
5.0±5%
12 to 40
5.0±5%
June 1994
1/17






GS-D200 Datasheet, Funktion
GS-D200/GS-D200S
BIPOLAR STEPPER MOTOR BASICS
Simplified to the bare essentials, a bipolar perma-
nent magnet motor consists of a rotating-perma-
nent magnet surrounded by stator poles carrying
the windings (fig. 5).
Figure 5: Simplified Bipolar Two Phase Motor
One-Phase-on or Wave Drive
Only one winding is energized at any given time
according to the sequence :
AB - CD - BA - DC
(BA means that the current is flowing from B to A).
Fig. 6 shows the sequence for a clockwise rotation
and the corresponding rotor position.
Two-Phase-on or Normal Drive
This mode gives the highest torque since two wind-
ings are energized at any given time according to
the sequence (for clockwise rotation).
AB & CD ; CD & BA ; BA & DC ; DC & AB
Fig. 7 shows the sequence and the corresponding
position of the rotor.
Bidirectional drive current is imposed on windings
A-B and C-D and the motor is stepped by commu-
tating the voltage applied to the windings in se-
quence. For a motor of this type there are three
possible drive sequences.
Half Step Drive
This sequence halves the effective step angle of
the motor but gives a less regular torque being one
winding or two windings alternatively energized.
Eight steps are required for a complete revolution
of the rotor.
The sequence is:
AB ; AB & CD ; CD ; CD & BA ; BA ; BA & DC ;
DC ; DC & AB
as shown in fig. 8.
By the configurations of fig. 6, 7, 8 the motor would
have a step angle of 90 ° (or 45 ° in half step). Real
motors have multiple poles pairs to reduce the step
angle to a few degrees but the number of windings
(two) and the drive sequence are unchanged.
Figure 6: One-Phase-on (Wave Mode) Drive
6/17

6 Page









GS-D200 pdf, datenblatt
GS-D200/GS-D200S
Figure 14: GS-D200 and GS-D200S Phase Current Programming
12
9
1
12
9
1
Chopper Frequency Programming
The chopper frequency is internally set to 17kHz,
and it can be changed by addition of external
components as follows. To increase the chopper
frequency a resistor must be connected between
Oscillator (pin 8) and Vss (pin 12, see fig. 15).
The resistor value is calculated according to the
formula:
Rf
=
306
fc 17
=
k
where fc = kHz Rf18k
To decrease the chopper frequency a capacitor
must be connected between Oscillator (pin 8) and
Gnd1 (pin 1). The capacitor value is calculated
according to the formula:
Cf
=
80.5
4.7fc
fc
=
nF
where fc = kHz
Figure 15: Chopper Frequency Programming
osc 8
12
1
12/17
fC < 17 KHz
osc
8
12
1
fC > 17 KHz

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