CURRENT CONTROLLER STEPPING MOTORS DESCRIPTION L6506/D linear int

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CURRENT CONTROLLER STEPPING MOTORS DESCRIPTION L6506/D linear int

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L6506 L6506D
CURRENT CONTROLLER STEPPING MOTORS
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 operating frequency chips. BLOCK DIAGRAM (pin's number referred DIP-18)
DIP18
SO20
ORDERING NUMBERS: L6506 L6506D
July 2003
L6506 -L6506D
CONNECTIONS (top view)
DIP18
SO20
ABSOLUTE MAXIMUM RATINGS
Symbol 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 SO20 Unit °C/W
ELECTRICAL CHARACTERESTICS (VCC 5.0V, Tamb 25°C; unless otherwise noted)
Symbol Parameter Supply Voltage Quiescent Supply Current Test Conditions Min. 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 Conditions Vsense Inputs 1.4V Min. -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 0.25 2.75 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, discrete power transistors drive stepper motors other similar loads. main function device sense control current each load windings. common on-chip oscillator drives dual chopper 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 until 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's oscillator 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 connecting 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.
L6506 used 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
DIM. MIN. 0.254 1.39
TYP. MAX. MIN. 0.010 1.65 0.46 0.25 23.24 2.54 20.32 3.93 1.27 1.59 0.055
inch TYP. MAX.
OUTLINE MECHANICAL DATA
0.065 0.018 0.010 0.915 0.335 0.100 0.800 0.280 0.155 0.130
DIP18
0.050 0.063
L6506 L6506D
DIM. MIN. 0.25 2.35 0.33 0.23 12.6 1.27 10.65 0.75 1.27 0.394 0.010 0.016 TYP. MAX. 2.65 0.51 0.32 MIN. 0.093 0.004 0.013 0.009 0.496 0.291
inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050
OUTLINE MECHANICAL DATA
SO20
(min.)8° (max.)
SO20MEC
L6506 -L6506D
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specification mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life support devices systems without express written approval STMicroelectronics. logo registered trademark STMicroelectronics 2003 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil Canada China Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States. http://www.st.com

CURRENT CONTROLLER STEPPING MOTORS DESCRIPTION L6506/D linear int

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