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UC3717A Dataheets PDF



Part Number UC3717A
Manufacturers Unitrode
Logo Unitrode
Description Stepper Motor Drive Circuit
Datasheet UC3717A DatasheetUC3717A Datasheet (PDF)

UC3717A Stepper Motor Drive Circuit FEATURES • Full-Step, Half-Step and Micro-Step Capability • Bipolar Output Current up to 1A • Wide Range of Motor Supply Voltage 10-46V • Low Saturation Voltage with Integrated Bootstrap • Built-In Fast Recovery Commutating Diodes • Current Levels Selected in Steps or Varied Continuously • Thermal Protection with Soft Intervention DESCRIPTION The UC3717A is an improved version of the UC3717, used to switch drive the current in one winding of a bipolar stepp.

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UC3717A Stepper Motor Drive Circuit FEATURES • Full-Step, Half-Step and Micro-Step Capability • Bipolar Output Current up to 1A • Wide Range of Motor Supply Voltage 10-46V • Low Saturation Voltage with Integrated Bootstrap • Built-In Fast Recovery Commutating Diodes • Current Levels Selected in Steps or Varied Continuously • Thermal Protection with Soft Intervention DESCRIPTION The UC3717A is an improved version of the UC3717, used to switch drive the current in one winding of a bipolar stepper motor. The UC3717A has been modified to supply higher winding current, more reliable thermal protection, and improved efficiency by providing integrated bootstrap circuitry to lower recirculation saturation voltages. The diagram shown below presents the building blocks of the UC3717A. Included are an LS-TTL compatible logic input, a current sensor, a monostable, a thermal shutdown network, and an H-bridge output stage. The output stage features built-in fast recovery commutating diodes and integrated bootstrap pull up. Two UC3717As and a few external components form a complete control and drive unit for LS-TTL or micro-processor controlled stepper motor systems. The UC3717A is characterized for operation over the temperature range of 0°C to +70°C. ABSOLUTE MAXIMUM RATINGS (Note 1) Voltage Logic Supply, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Output Supply, Vm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V Input Voltage Logic Inputs (Pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V Analog Input (Pin 10). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC Reference Input (Pin 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Input Current Logic Inputs (Pins 7, 8, 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA Analog Inputs (Pins 10, 11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -10mA Output Current (Pins 1, 15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1.2A Junction Temperature, TJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . -55°C to +150°C Note 1: All voltages are with respect to ground, Pins 4, 5, 12, 13. Currents are positive into, negative out of the specified terminal. Pin numbers refer to DIL-16 package. Consult Packaging Section of Databook for thermal limitations and considerations of package. BLOCK DIAGRAM 4/97 1 CONNECTION DIAGRAMS DIL-16 (TOP VIEW) J or N Package UC3717A PLCC-20 (TOP VIEW) Q Package PACKAGE PIN FUNCTION FUNCTION PIN N/C 1 BOUT 2 Timing 3 Vm 4 Gnd 5 N/C 6 Gnd 7 VCC 8 I1 9 Phase 10 N/C 11 I0 12 Current 13 VR 14 Gnd 15 N/C 16 Gnd 17 Vm 18 AOUT 19 Emitters 20 ELECTRICAL CHARACTERISTICS (Refer to the test circuit, Figure 6. Vm = 36V, VCC = 5V, VR = 5V, TA = 0°C to 70°C, unless otherwise stated, TA = TJ.) PARAMETERS TEST CONDITIONS Supply Voltage, Vm (Pins 3, 14) Logic Supply Voltage, VCC (Pin 6) Logic Supply Current, ICC (Pin 6) IO = I1 = 0 Thermal Shutdown Temperature Logic Inputs Input Low Voltage, (Pins 7, 8, 9) Input High Voltage, (Pins 7, 8, 9) Low Voltage Input Current, (Pins 7, 8, 9) VI = 0.4V, Pin 8 VI = 0.4V, Pins 7 and 9 High Voltage Input Current, (Pins 7, 8, 9) VI = 2.4V Comparators Comparator Low, Threshold Voltage (Pin 10) VR = 5V; IO = L; I1 = H Comparator Medium, Threshold Voltage (Pin 10) VR = 5V; IO = H; I1 = L Comparator High, Threshold Voltage (Pin 10) VR = 5V; IO = L; I1 = L Comparator Input, Current (Pin 10) Cutoff Time, tOFF RT = 56kΩ, CT = 820pF Turn Off Delay, tD (See Figure 5) Source Diode-Transistor Pair Saturation Voltage, VSAT (Pins 1, 15) Im = -0.5A, Conduction Period (See Figure 5) Im = -0.5A, Recirculation Period Saturation Voltage, VSAT (Pins 1, 15) Im = -1A, Conduction Period (See Figure 5) Im = -1A, Recirculation Period Leakage Current Vm = 40V Diode Forward Voltage, VF Im = -0.5A Im = -1A MIN TYP MAX UNITS 10 46 V 4.75 5.25 V 7 15 mA +160 +180 °C 0.8 V 2 VCC V -100 µA -400 mA 10 µA 66 80 90 mV 236 250 266 mV 396 420 436 mV ±20 µA 25 35 µs 2 µs 1.7 2.1 V 1.1 1.35 V 2.1 2.8 V 1.7 2.5 V 300 µA 1 1.25 V 1.3 1.7 V 2 UC3717A ELECTRICAL (Refer to the test circuit, Figure 6. VM = 36V, VCC = 5V, VR = 5V, TA = 0°C to 70°C, unless CHARACTERISTICS (cont.) otherwise stated, TA = TJ.) PARAMETERS TEST CONDITIONS MIN TYP MAX UNITS Sink Diode-Transistor Pair Saturation Voltage, VSAT (Pins 1, 15) Im = 0.5A 0.8 1.1 1.35 V Im = 1A 1.6 2.3 V Leakage Current Vm = 40V 300 µA Diode Forward Voltage, VF Im = 0.5A Im = 1A 1.1 1.5 1.4 2 V V Figure 1. Typical Source Saturation Voltage vs Output Current (Recirculation Period) Figure 2. Typical Source Saturation Voltage vs Output Current (Conduction Period) Figure 3. Typical Sink Saturation Voltage vs Output Current Figure 4. Typical P.


TDA8715 UC3717A AN44071A-VF


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