Module, Phase Stepping Motor Driver, 1.75A Features: heat generat

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Module, Phase Stepping Motor Driver, 1.75A Features: heat generat

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NTE1885 Integrated Circuit
Module, Phase Stepping Motor Driver, 1.75A
Features: heat generation constant current chopper system. Functions pause action power down. Able used stepping motor hybrid typ, P.M. type, V.R. type. Inverter buffer provides direct drive, phase dual excitation. Built sensing power resistors load current. Protection elements fly-back voltage included. Absolute Maximum Ratings: +25°C unless otherwise specified) Supply Voltage, (Quiescent) Phase Peak Current, 2.1A Operating Case Temperature, +105°C Junction Temperature, +150°C Storage Temperature Range, Tstg -40° +125°C Recommended Operating Conditions: +25°C Unless othrwise specified) Supply Voltage Range, VCC1 Phase Peak Current, 1.5A Operating Characteristics: +25°C, VCC1 36V, VCC2 Unless otherwise specified) Parameter Diode Forward Voltage Symbol Vdf-1 Vdf-2 Output Saturation Voltage Vsat-1 Vsat-2 Output Current Frequency Thermal Resistance (Note IO-1 TR1, TR2, TR3, TR4, Test Conditions 0.3A 0.5A GND, VCC1 GND, VCC1 Unit °C/W
0.98 1.05 1.12 (Fixed OSC) 13.5
Note From Junction each transistor diode substrate
Description Operation: Constant Current Chopper Drive When phase drive input activated, motor winding current increases. predetermined current (the rated current motor), applied voltage winding begins switched ON-OFF maintain constant current. This constant-current chopper drive offering higher efficiency (30% under certain condition) than constant-voltage drive, causing relatively large noise switching operation. method consists self-excitation separate excitation methods. separate excitation, oscillator required, externally conducted. self excitation method simpler circuit, requiring oscillator, using resistance inductance motor winding instead. When voltage several times larger than rated voltage applied motor, change winding currents occurs. time when currents reach 63.2% rated current (IO) shows higher-speed response with regard rise winding current acts time constant series network with rated applied voltage. Without constant current circuit, over current will ramp constant value, that constant- current chopper drive needed. chopping conducted below constant value, that winding resistance rated current must satisfy following equation: Vsat Where Winding resistance phase motor Vsat: Vsat-1 Vsat-2
With increase winding inductance, flyback energy increased and, when transistors each-phase drive OFF, power loss increased. Considering following motor recommended: Motor specification (4-phase unipolar stepping motor) Rated current: 0.5A/phase Winding resistance: 10/phase Inductance: 10mH/phase Chopper Operation (Note: TR's internal transistors used reference purposes; internal protection diodes; represent motor windings) operation unipolar 2-phase excitation 4-phase stepping motor described When High-Level input Low-Level input applied Pin5 (phase Pin6 (phase respectively, turned Since terminal (comparator) potential, comparator output (point becomes High), turning TR7. This also causes turned current winding increases shown equation: V(sat) -t/) Where Vsat: Vsat1: Vsat2: time constant Winding inductance phase Winding resistance phase plus emitter resistance, etc. Vsat-1 Vsat-2 VCE(sat) chopper transistors (TR1, VCE(sat) phase-drive transistors (TR2, (Diodes, internal)
also
When voltage drop emitter resistor (internal) increased external standard voltage voltage (the voltage Pin9), comparator output becomes turns with OFF. point which comparator output changes from High called Upper Trip Point expressed VUTP. VUTP since RO1, negligible therefore VUTP VCC2 where motor series winding resistors When comparator output becomes with OFF, winding current decreases follows: V(sat) When voltage Pin8 reaches certain value, comparator output becomes High turns with increase winding current. These steps repeated. point which comparator output changed from High referred Lower Trip Point, expressed VLTP. VLTP, energy stored winding discharged through TR2, R16, R17, feedbacked Therefore, half flows into voltage Pin8 becomes VUTP. VLTP VUTP change motor winding current follows: VUTP VLTP VCC2
flyback voltage generated turn phase drive, returned power supply through TR2, R16, R17, providing power consumption.
Typical Application Circuit
+VCC1 (36V) (43V.3W) Power Down Input Pause Action Input Voltage Phase Stepping Motor 0.1µf 10µf
2.520 (64.0) 2.190 (55.6) .334 (8.5)
1.440 (36.4) .737 (18.7) .141 (3.6) Holes) .100 (2.54) 1.700 (43.18) .114 (5.5)
1.030 (32.5)
.158 (4.0)

Module, Phase Stepping Motor Driver, 1.75A Features: heat generat

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