GS-D500A
100V/5A STEP AND MICROSTEP DRIVE BOARD
FOR STEPPER MOTORS
June 1994
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FEATURES
100V Operating Supply Voltage
5A/phase peak current
5, 25, 125 microsteps/step
Full step and half step operation
User selectable phase current
90
out of phase chopping to save power con-
sumption
Galvanic isolation
Full output protection against short-circuits
Thermal and undervoltage protection
Step clock in excess of 200kHz
Fault indication output
Special circuit to reduce midrange instability
DESCRIPTION
The GS-D500A is a member of the SGS-THOM-
SON family of stepper motor driver modules and
boards. It drives motors in full step, half step and
microstep mode.
On top of that if offers an unusua lly large number
of features that allow a complete control of the
electromechanical characteristics of the motion
system to obtain optimum performance.
The powermos output stages offer both low con-
duction and commutation losses for increased effi-
ciency; this, combined with a complete protection
scheme, results in an extremely rugged unit suit-
able for harsh environment operation.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Vs
DC Supply Voltage
110
V
Vss
DC Logic Supply Voltage
13
V
lph
Output Current per Bridge
6
Apk
li
Logic Input Current
30
mA
Vis
Isolation Voltage
500
V
Tstg
Storage Temperature Range
20 to +85
C
Thop
Operating Heatsink Temperature
+85
C
Note: Absolute maximum ratings are limit values above which the unit can be permanently damaged
* Thermal protection intervention @ Th > 90
C
ELECTRICAL CHARACTERISTICS (T
amb
= 25
C and V
s
= 24V unless otherwise specified)
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Vs
DC Supply Voltage
12
100
V
Vss
DC Logic Supply Voltage
11.5
12
12.5
V
Iph
Phase Current per Output
*
0.5
5
A
li
Logic Input Current
10
mA
Vsl
On board Logic
Supply Output
4.75
5
5.25
V
Iosl
On board Logic
Supply Current Output
100
mA
fc
Clock Pulse Frequency
200
kHz
*
Output Shorts Protection phase-to-phase, phase-to-ground.
Note: the unit requires an input filtering capacitor in the range of 4700 to 10000
F/100V, with low ESR and located as close as possible to the
board.
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Figure 1. Signals timing
GS-D500A
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Figure 2. Block diagram
GS-D500A
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MECHANICAL DATA (dimensions are in millimeters)
GS-D500A HARDWARE AVAILABLE COMMANDS
SW1, SW2, SW3
Microsteps/step programming
SW4
Phase peak current selection
SW5
Midrange stabilization ON/OFF
SW6
Current reduction at rest
R42
Phase AB current programming
R43
Phase CD current programming
GS-D500A
GS-D500A CONNECTORS PINS DESCRIPTION
CONNECTOR J1
J1-1
Phase A output
J1-2
Phase B output
J1-3
Phase C output
J1-4
Phase D output
J1-6
Ground
CONNECTOR J2
J2-1
Motor Supply Voltage
J2-3
Auxiliary Supply Voltage (+12V)
J2-2,4
Ground
CONNECTOR J3
Pin
Function
J3-1
Step clock isolated input (see fig. 3): this
is a logic input that performs the step
function, i.e. on every transition of this
input the motor is moved one step in the
proper direction.
J3-2
Direction isolated input (see fig. 4): the
logic state applied to this pin decides the
rotation direction of the motor shaft.
J3-4
Microsteps/step rate remote program-
ming (SW1).
J3-5
On board +5V output
J3-6,7
Return path for on board +5V output
J3-8
Disable input (see fig. 6): a logic high
level applied to this input causes the
power driver outputs to float. This condi-
tion allows the manual positioning of the
system.
Care must be used when this input is
activated because the detention torque
is lost.
J3-9
Optocoupler supply voltage
J3-10
Zero current control isolated input (see
fig. 5): when activated the phase current
is reduced to zero
J3-12
Microsteps/step rate remote program-
ming (SW2)
J3-13
Fault logic output (see fig. 9): this ouput
is at a low logic level whenever an
anomalous condition is detected.
J3-15
Microsteps/step rate remote program-
ming (SW3)
Figure 3. Stepclock input circuit
Figure 4. Direction input circuit
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GS-D500A
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