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PDF SPMD250STP Data sheet ( Hoja de datos )
| Número de pieza | SPMD250STP | |
| Descripción | 2.5 A bipolar stepper motor drive module | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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SPMD250STP
2.5 A bipolar stepper motor drive module
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 SPMD250STP is a drive module 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 SPMD250STP has PowerMOS
outputs to significantly reduce both commutation
and conduction losses. A further benefit offered
by the SPMD250STP is the complete protection
of the outputs against any type of shorts.
Table 1.
Device summary
Order code
SPMD250STP
January 2008
Rev 1
1/29
www.st.com
29
1 page  
SPMD250STP
2 Electrical characteristics
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Table 2.
Symbol
Electrical characteristics
(TA = 25°C and VS = 24V unless otherwise specified)
Parameter
Test conditions
Value
Min Typ Max
Unit
Vs DC supply voltage
Vss DC logic supply voltage
Is Quiescent supply current
Pin 18
12 40 V
5V
20 mA
Iss Quiescent logic supply current Pin 12 Vss = 5 V
60 mA
Vi Input voltage
Pin
3,4,6,7,10,11
Low
High
2
0.8 V
Vss V
Ii Input current
Pin
3,4,6,7,10,11
Vi = Low
Vi = High
0.6
10
mA
µA
Vsat
Source/sink saturation voltage
Pin
14,15,16,17
Io = 2 A
1.8 V
Io Phase current
2.5 A
IoL Current limit intervention
5A
fc Chopper frequency
17 kHz
tclk Stepckl width
Pin 6 (Figure 1 on page 6) 0.5
µs
ts Set up time
"
1 µs
th Hold time
"
1 µs
tr Reset width
"
1 µs
trclk Reset to clock set up time
"
1 µs
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SPMD250STP
Bipolar stepwpwewr .mDaottaoSrhebeats4Uic.csom
5.3 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
Figure 7. Two-phase-on (normal mode) drive
11/29
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet SPMD250STP.PDF ] | |
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