E-TEA3718SFP ,Stepper Motor DriverElectrical specifications . . . . . . 73.1
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E-TEA3718DP-E-TEA3718SDP-E-TEA3718SFP
Stepper Motor Driver
January 2009 Rev 2 1/26
TEA3718Stepper motor driver
Features Half-step and full-step mode Bipolar drive of stepper motor for maximum
motor performance Built-in protection diodes Wide range of current control 5 to 1500 mA Wide voltage range 10 to 50 V Designed for unstabilized motor supply voltage Current levels can be selected insteps or
varied continuously Thermal overload protection Alarm output or pre-alarm output
ApplicationsThe TEA3718 is a bipolar monolithic integrated
circuit intended to control and drive the current in
one winding of a bipolar stepper motor.
DescriptionThe circuits consist of an LS-TTL compatible logic
input, a current sensor, a monostable and an
output stage with built-in protection diodes. Two
TEA3718 ICs and a few external components
form a complete control and drive unit for LS-TTL
or microprocessor-controlled stepper motor
systems.
Figure 1. Block diagramTM: Multiwatt is a trademark of STMicroelectronics
Table 1. Device summary
Pin connections 2/26
1 Pin connections
Figure 2. Package pin locations (top views)
Contents 3/26
Contents Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Device diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Functional blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1 Alarm output (TEA3718SP , TEA3718DP and TEA3718SDP) . . . . . . . . . 14
4.2 Pre-alarm output (TEA3718SFP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Current reduction in alarm condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175.1 Input logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2 Phase input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3 Current sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4 Single-pulse generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5 Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.6 VSS, VS and VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.7 Analog control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Contents 4/26
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196.1 Motor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Unused inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.4 Operating sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Device diagrams 5/26
2 Device diagrams
Figure 3. Detailed block diagram (TEA3718SFP)
Figure 4. Detailed block diagram (TEA3718SP)
Device diagrams 6/26
Table 2. Pin functions
Table 3. Device comparison table
Electrical specifications 7/26
3 Electrical specifications
3.1 Absolute maximum ratings
3.2 Recommended operating conditions
Table 4. Absolute maximum ratings
Table 5. Recommended operating conditions
Electrical specifications 8/26
3.3 Thermal data
Figure 5. Maximum power dissipation
Figure 6. Typical external component configuration
Table 6. Thermal data Soldered on a 35 µm thick 4 cm2 PC board copper area
Electrical specifications 9/26
Figure 7. Output waveforms
Electrical specifications 10/26
3.4 Electrical characteristics
Table 7. Electrical characteristics(1) Vs = Vss = 5 V, ± 5%, Vmm = 10 V to 45V, Tamb = 0 to 70oC (Tamb = 25o C for TEA3718SFP) unless otherwise specified. Values in parentheses apply only to E-TEA3718SFP and E-TEA3718SFPTR mounted in SO20 package.
Electrical specifications 11/26
Figure 8. Sink driver VCE sat against Iout and Tj
Figure 9. Lower diode Vf against I OUT and Tj
Figure 10. Source driver VCE sat against IOUT and Tj
Electrical specifications 12/26
Figure 11. Upper diode Vf against IOUT and Tj
Figure 12. Iref against junction temperature
Figure 13. Comparator input current against Tj and VC
Functional blocks 13/26
4 Functional blocks
Figure 14. Alarm output (TEA3718SP)
Figure 15. Pre-alarm output (TEA3718SFP)
