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TEA3718 Dataheets PDF



Part Number TEA3718
Manufacturers ST Microelectronics
Logo ST Microelectronics
Description STEPPER MOTOR DRIVER
Datasheet TEA3718 DatasheetTEA3718 Datasheet (PDF)

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 integra.

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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 T1°C the alarm output becomes low (TEA3718SP) When Tj reaches T2°C the prealarm output becomes low (T2


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