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| TEA3718 TEA3718S STEPPER MOTOR DRIVER ADVANCE DAT A 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 IN STEPS OR VARIED CONTINUOUSLY THERMAL OVERLOAD PROTECTION ALARM OUTPUT OR PRE-ALARM OUTPUT (see internal table) DESCRIPTION TheTEA3718 and TEA3718Sare bipolar monolithic integrated circuits intended to control and drive the current in one winding of a bipolar stepper motor. The 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 or TEA3718S and a few external components form a complete control and drive unit for LS-TTL or microprocessor-controlled stepper motor systems. PIN CONNECTIONS (top views) Powerdip 12 + 2 + 2 SO-20 ORDERING NUMBERS : TEA3718SDP TEA3718DP ORDERING NUMBER : TEA3718SFP MULTIWATT-15 ORDERING NUMBER : TEA3718SP TEA3718SP (Multiwatt-15) TEA3718SFP (SO-20) TEA3718DP TEA3718SDP (Powerdip 12+2+2) December 1991 1/16 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. TEA3718-TEA3718S BLOCK DIAGRAM TEA3718S BLOCK DIAGRAM TEA3718 2/16 TEA3718-TEA3718S PIN FUNCTIONS Name OUT B PULSE TIME Fu nctio n Output Connection (with pin OUTA). The output stage is a "H" bridge formed by four transistors and four diodes suitable for switching applications. A parallel RC network connected to this pin sets the OFF time of the lower power transistors. The pulse generator is a monostable triggered by the rising edge of the output of the comparators (toff = 0.69 R TCT). Supply Voltage Input for Half Output Stage Ground Connection. In SO-20L and Powerdip these pins also conduct heat from die to printed circuit copper. Supply Voltage Input for Logic Circuitry This pin and pin IN0 are logic inputs which select the outputs of three comparators to set the current level. Current also depends on the sensing resistor and reference voltage. See truth table. This TTL-compatible logic input sets the direction of current flow through the load. A high level causes current to flow from OUT A (source) to OUT B (sink). A Schmitt trigger on this input provides good noise immunity and a delay circuit prevents output stage short circuits during switching. See INPUT 1 Input connected to the three comparators. The voltage across the sense resistor is feedback to this input through the low pass filter RCCC. The lower power transistor are disabled when the sense voltage exceeds the reference voltage of the selected comparator. When this occurs the current decays for a time set by RTCT, Toff = 0.69 RTCT. A voltage applied to this pin sets the reference voltage of the three comparators. Reference voltage with the value of RS and the two inputs IN0 and IN1 determines the output current. Supply voltage input for half output stage See pin OUT B Connection to lower emitters of output stage for insertion of current sense resistor When Tj reaches T1C the alarm output becomes low (TEA3718SP) When Tj reaches T2C the prealarm output becomes low (T2 VS(B) GND VSS IN1 PHASE IN0 COMPARATOR INPUT REFERENCE VS(A) OUT A SENSE RESISTOR ALARM PRE-ALARM 3/16 TEA3718-TEA3718S ABSOLUTE MAXIMUM RATINGS Symbol VSS VS VI Supply Voltage Input Voltage: Logic Inputs Analog Inputs Reference Input Input Current Logic Inputs Analog Inputs Output Current Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Parameters Valu e 7 50 6 VSS 15 -10 -10 1.5 +150 0 to 70 -55 to +150 Un it V V V V V mA mA A C C C ii IO TJ Top Tstg THERMAL DATA Symb ol Rth(j-c) Rth(j-a) Parameter Maximum Junction-case Thermal Resistance Maximum Junction-ambient Thermal Resistance 2 SO -20L 16 60 * Po werdip Mu lt iwatt 11 45 * 3 40 Uni t C/W C/W * Soldered on a 35 m thick 4 cm PC board copper area. RECOMMENDED OPERATING CONDITIONS Symb ol vss VS im Tamb tr tf Supply Voltage Supply Voltage Output Current Ambient Temperature Rise Time Logic Inputs Fall Time Logic Inputs Parameter Min . 4.75 10 0.020 0 - - - - T yp. 5 - - Max. 5.25 45 1.2 70 2 2 Unit V V A C s s COMPARISON TABLE Device TEA3718SDP TEA3718SFP TEA3718SP TEA3718DP Current 1.5A 1.5A 1.5A 1.5A Package Powerdip 12+2+2 SO-20L Multiwatt-15 Powerdip 12+2+2 X not connected Alarm Pre-Alarm not connected x 4/16 TEA3718-TEA3718S MAXIMUM POWER DISSIPATION Figure 1. Figure 2. RS = 1 INDUCTANCE FREE RC = 470 CC = 820 pF CERAMIC Rt = 56 k Ct = 820 pF CERAMIC P = 500 R2 = 1 K 5/16 TEA3718-TEA3718S ELECTRICAL CHARACTERISTICS (VCC = 5V, 5%, Vmm = 10V to 45V, Tamb = 0 to 70C (Tamb = 25C for TEA3718FP/SFP) unless otherwise specified) Symbo l ICC VIH VIL IIH IIL VCH VCM VCL ICO Ioff Vsat Ptot toff td Vsat Iref Vsat Supply Current High Level Input Voltage - Logic Inputs Low Level Input Voltage - Logic Inputs High Level Input Current - Logic Inputs Low Level Input Current - Logic Inputs (VI = 0.4V) Comparator Thershold Voltage (VR = 5V) IO = 0 IO = 0 IO = 0 I1 = 0 I1 = 0 I1 = 1 Parameter Min . 2 -0.4 390 230 65 -20 25 SO20/Powerdip Multiwatt T yp. 420 250 80 3.1 30 1.6 0.8 0.4 1.05 1.35 1.1 1.25 1 1.2 1 1.1 Max. 25 0.8 20 440 270 90 20 100 2.8 3.2 3.6 35 1 1.2 (1.3) 1.5 (1.7) 1.3 1.7 1.5 (1.6) 1.7 (1.9) 5 1.2 (1.3) 1.3 (1.5) 1.3 1.5 1.4 (1.6) 1.5 (1.9) Unit mA V V A mA mV mV mV A A V V W ms s V mA V V V V V V mA V V V V V V Comparator Input Current Output Leakage Current (I O = 0, I1 = 1 Tamb = 25C Total Saturation Voltage Drop (Im = 1A) Total Power Disssipation - Im = 1A, fs = 30KHz Cut off Time (see figure 1 and 2, Vmm = 10V, Vton > 5s Turn off Delay (see fig. 1 and 2, Tamb = 25C, dVC/dt>50mV/s) Alarm Output Saturation Voltage - IO = 2mA Reference Input Current, VR = 5V Source Diode Transistor Pair Saturation Powerdip Im = 0.5A Voltage Powerdip Im = 1A Multiwatt Im = 0.5A Multiwatt Im = 1A (Multiwatt) Vf Isub Vsat Diode Forward Voltage Substrate Leakage Current Sink Diode Transistor Pair Saturation Voltage If = 0.5A If = 1A If = 1A Powerdip Im = 0.5A Powerdip Im = 1A Multiwatt Im = 0.5A Multiwatt Im = 1A Vf Diode Forward Voltage If = 0.5A If = 1A Notes: (...) Only for TEA3718SFP mounted in SO-20L package. 6/16 TEA3718-TEA3718S 7/16 TEA3718-TEA3718S FUNCTIONAL BLOCKS Figure A: ALARM OUTPUT (TEA3718SP - TEA3718DP) TEA3718 Figure B: PRE-ALARM OUTPUT (TEA3718SDP - TEA3718SFP) TEA3718S 8/16 TEA3718-TEA3718S ALARM OUTPUTS (TEA3718SP - TEA3718DP) The alarm output becomes low when the junction temperature reaches TC. When an alarm condition occours, parts of the supply voltage (dividing bridge R - RC) is fed to the comparator input pin (Fig. A) Depending of the RCC value the behaviour of the circuit is different on alarm condition: 1) RC > 80 the output stage is switched off 2) RC > 60 the current in the motor windings is reduced according to the approximate formula: (see also fig. E and F) Im = VTH VCC RC - * RS R + RC RS with VTH = Threshold of the comparator (VCH, VCM, VCL) R = 700 (typical) For several Multiwatt packages a common detection can be obtained as in Fig. D PRE-ALARM OUTPUT When the junction temperature reaches T1C (typ. = 170C) a prealarm signal is generated. Soft thermal protection occours when function temperature reaches T2 (T2 > T1) Figure C: Alarm Detection for Powerdip Package Figure D: CommonDetection for Several Multiwatt Package 9/16 TEA3718-TEA3718S Figure E: (typical curve) Current Reduction in the Motor on Alarm Condition. Figure F: (Vref 5V) Block Diagram for Half Current on Alarm Condition. Notes: 1. Resistance values given here are for the Vch threshold. They should be adjusted using other comparators threshold or other Vref value. TYPICAL APPLICATION Phase A IN0A IN1A Phase B IN0B IN1B 10/16 TEA3718-TEA3718S FUNCTIONAL DESCRIPTION The circuit is intended to drive a bipolar constant current through one motor winding. The constant current is generated through switch mode regulation. Thereis a choice of threedifferent current levelswith the two logic inputs lN0 and lN1. The current can also be switched off completely. INPUT LOGIC If any of the logic inputs is left open, the circuit will treat it as a high level input. IN0 H L H L IN1 H H L L Current Level No Current Low Current Medium Current Maximum Current The single pulse switches off the power feed to the motor winding, causing the winding current to decrease during toff. If a new trigger signal should occur during toff, it is ignored. OUTPUT STAGE The output stage contains four Darlington transistors and four diodes, connected in an H-bridge. The two sinking transistors are used to switch the power supplied to the motor winding, thus driving a constant current through the winding. It should be noted however, that it is not permitted to short circuit the outputs. VSS, VS, VR The circuit will stand any order of turn-on or turn-off the supply voltages VSS and VS. Normal dV/dt values are then assumed. Preferably, VR should be trackingVSS during poweron and power-off if VS is established. ANALOG CONTROL The current levels can be varied continuously if VR is varied with a circuit varying the voltage on the comparator terminal. PHASE - This input determines the direction of current flow in the winding, depending on the motor connections. The signal is fed through a Schmidttrigger for noise immunity, and through a time delay in order to guarantee that no short-circuit occurs in the output stage during phase-shift. High level on the PHASE input causes the motor current flow from Out A through the winding to Out B. lH0 and lH1 - The current level in the motor winding is selected with these inputs. The values of the different current levels are determined by the reference voltage VR togetherwith the value of the sensing resistor RS. CURRENT SENSOR This part contains a current sensing resistor (RS), a low pass filter (RC, CC) and three comparators. Only one comparator is active at a time. It is activated by the input logic according to the current level chosen with signals IN0 and IN1. The motor current flows through the sensing resistor RS. When the current has increased so that the voltage across RS becomes higher than the reference voltage on the other comparator input, the comparator outputgoes high, which triggers the pulse generator and its output goes high during a fixed pulse time (toff), thus switching off the power feed to the motor winding, and causing the motor current to decrease during toff. SINGLE-PULSE GENERATOR The pulse generator is a monostable triggered on the positive going edge of the comparator output. The monostableoutputis high during thepulsetime, toff, which is determined by the timing components Rt and Ct. toff = 0.69 Rt Ct POWER LOSSES VS OUTPUT CURRENT 11/16 TEA3718-TEA3718S PRINCIPAL OPERATING SEQUENCE APPLICATION NOTES MOTOR SELECTION Some stepper motors are not designed for continuous operation at maximum current. As the circuit drives a constant current through the motor, its temperature might increase exceedinglyboth at low and high speed operation. Also, some stepper motors have such high core losses that they are not suited for switch mode current regulation. UNUSED INPUTS Unused inputs shouldbe connectedto proper voltage levels in order to get the highest noise immunity. INTERFERENCE As the circuit operates with switch mode current regulation, interference generation problems might arise in some applications. A good measure might then be to decouple the circuit with a 15 nF ceramic capacitor, located near the packagebetween power line VS and ground. The ground lead between RS, CC and circuit GND should be kept as short as possible. This applies also to the lead between the sensing resistor RS and point S, see FUNCTIONAL BLOCKS. 12/16 TEA3718-TEA3718S MULTIWATT15 PACKAGE MECHANICAL DATA DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.66 1.02 17.53 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.870 1.27 17.78 1 0.55 0.75 1.52 18.03 0.019 0.026 0.040 0.690 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 0.050 0.700 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.060 0.710 MIN. inch TYP. MAX. 0.197 0.104 0.063 13/16 TEA3718-TEA3718S POWERDIP 16 PACKAGE MECHANICAL DATA DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.30 1.27 8.80 2.54 17.78 7.10 5.10 0.130 0.050 0.38 0.51 0.85 0.50 0.50 20.0 0.346 0.100 0.700 0.280 0.201 0.015 1.40 mm TYP. MAX. MIN. 0.020 0.033 0.020 0.020 0.787 0.055 inch TYP. MAX. 14/16 TEA3718-TEA3718S SO20 PACKAGE MECHANICAL DATA DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 7.4 0.5 12.6 10 1.27 11.43 7.6 1.27 0.75 8 (max.) 0.291 0.020 13.0 10.65 0.35 0.23 0.5 45 (typ.) 0.496 0.394 0.050 0.450 0.299 0.050 0.030 0.512 0.419 0.1 mm TYP. MAX. 2.65 0.3 2.45 0.49 0.32 0.014 0.009 0.020 0.004 MIN. inch TYP. MAX. 0.104 0.012 0.096 0.019 0.013 15/16 TEA3718-TEA3718S Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved MULTIWATT (R) is a Registered Trademark of the SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 16/16 |
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