CURRENT CONTROLLER STEPPING MOTORS ADVANCE DESCRIPTION L6506

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CURRENT CONTROLLER STEPPING MOTORS ADVANCE DESCRIPTION L6506

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L6506 L6506D
CURRENT CONTROLLER STEPPING MOTORS
ADVANCE
DESCRIPTION L6506/D linear integrated circuit designed sense control current stepping motors similar devices. When used conjunction with L293, L298, L7150, L6114/L6115, chip forms constant current drive inductive load performs interface function from control logic thru power stage. more devices synchronized using sync pin. this mode operation oscillator master chip sets operatingfrequency chips. BLOCK DIAGRAM (pin's number referred DIP-18)
DIP-18
ORDERING NUMBERS: L6506 L6506D1
January 1991
This advanced information product development undergoing evaluation. Details subject change without notice.
L6506 -L6506D
CONNECTIONS (top view)
DIP18
SO20
ABSOLUTE MAXIMUM RATINGS
Symb Ptot Tstg Supply Voltage Input Signals Total Power Dissipation (Tamb 70°C) DIP18 Total Power Dissipation (Tamb SO20 Junction Temperature Storage Temperature Parameter Value Unit
THERMAL DATA
Symbol j-amb Parameter Thermal Resistance Junction-ambient Max. DIP18 °C/W
ELECTRICAL CHARACTERESTICS (VCC 5.0V, Tamb 25°C; unless otherwise noted)
Symbol Parameter Supply Voltage Quiescent Supply Current Test nditions Typ. Max. Unit
COMPARATOR SECTION
Symbol Parameter Input Voltage Range Input Offset Voltage Input Offset Current Input Bias Current Response time VREF 1.4V VSENS Test nditions Vsense Inputs 1.4V -0.3 Typ. Max. ±5.0 ±200 Unit
L6506 L6506D
ELECTRICAL CHARACTERISTICS (continued) COMPARATOR SECTION PERFORMANCE (Over Operating Temperature Range)
Symbol Parameter Input Offset Voltage Input Offset Curent Test Condtions 1.4V Min. Typ. Max. ±500 Unit
LOGIC SECTION (Over Operating Temperature Range compatible inputs outputs)
Symbol Parameter Input High Voltage Input Voltage Output High Voltage Ouptut Voltage Ouput Source Current Outputs 4.75V 400µA 4.75V 4.75V 2.75 0.25 Test Condtions Min. Typ. Max. Unit
OSCILLATOR
Symbol fosc VthL VthH Parameter Frequency Range Lower Threshold Voltage Higher Threshold Voltage Internal Discharge Resistor Test Condtions Min. 0.33 0.66 Typ. Max. Unit
CIRCUIT OPERATION L6506 intended with dual bridge drivers, such L298, quad darlington arrays, such L7150, quad DMOS array such L6114L6115,or discrete power transistorsto drive stepper motors other similar loads. main function device sense controlthe current each load windings. common on-chip oscillator drives dualchopper sets operating frequency pulse width modulated drive. network sets operating frequency which given equation 0.69 oscillator provides pulses flipflops which turn cause outputs activate drive. When current load winding reaches programmed peak value, voltage across sense resistor (Rsense equal Vref corresponding comparator resets flip-flop interrupting drive current untilthe next oscillator pulse occurs. peak current each winding programmed selecting value sense resis-
Vref. Since separate inputs provided each chopper, each loads programmed independently allowing device used implement microstepping motor. Lower threshold L6506'soscillator VCC. Upper threshold internal discharge resistor Ground noise problems multiple configurations avoided synchronizing oscillators. This done connecting sync pins each devices with oscillator output master device connectingthe unused oscillators ground. equations active time sync pulse (T2), inactive time sync signal (T1) duty cycle found looking figure 0.69 0.69
L6506 -L6506D
substituting equations into equation solving value following equations external components derived 0.69 Looking equation easily seen that minimum pulse width will occur when value minimum value maximum. Therefore, when evaluating equation minimum value should used guarantee required pulse width.
Figure Oscillator Circuit Waveforms.
APPLICATIONS INFORMATION circuits shown figure L6506 implement constant current drives stepper motors. Figure shows L6506 used with L298 drive phase bipolar motor. peak current calculated using equation Vref Ipeak Rsense circuit Fig.2 used applications requiring different peak hold current values modifying reference voltage.
L6506may usedto implement either full step half step drives. case phase bipolar stepper motor applications, half step drive used, bridge requires additional input disable power stage during half step. used conjunction with L298 enable inputs used this purpose. quad darlington array phase unipolar motor applications half step implemented using phase inputs. L6506 also used implement microstepping either bipolar unipolar motors.
L6506 L6506D
Figure Application Circuit Bipolar Stepper Motor Driver. (pin's number referred DIP18)
L6506 -L6506D
DIP18 PACKAGE MECHANICAL DATA
DIM. MIN. 1.27 1.59 2.54 20.32 3.93 0.130 0.050 0.063 0.254 1.39 0.46 0.25 23.24 0.335 0.100 0.800 0.280 0.155 1.65 TYP. MAX. MIN. 0.010 0.055 0.018 0.010 0.915 0.065 inch TYP. MAX.
L6506 L6506D
SO20 PACKAGE MECHANICAL DATA
DIM. MIN. 12.6 1.27 11.43 1.27 0.75 (max.) 0.291 0.020 13.0 10.65 0.35 0.23 (typ.) 0.496 0.394 0.050 0.450 0.299 0.050 0.030 0.512 0.419 TYP. MAX. 2.65 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
L6506 -L6506D
Information furnished believed accurate reliable. However, SGS-THOMSON Microelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights SGS-THOMSON Microelectronics. Specifications mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. SGS-THOMSON Microelectronics products authorized critical components life support devices systems without express written approval SGS-THOMSON Microelectronics. 1994 SGS-THOMSON Microelectronics Rights Reserved SGS-THOMSON Microelectronics GROUP COMPANIES Australia Brazil France Germany Hong Kong Italy Japan Korea Malaysia Malta Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thaliand United Kingdom U.S.A.

CURRENT CONTROLLER STEPPING MOTORS ADVANCE DESCRIPTION L6506

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