L6506

L6506 STMICROELECTRONICS | Alldatasheet

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CURRENT CONTROLLER FOR STEPPING MOTORS

DESCRIPTION

The L6506/D is a linear integrated circuit designed to sense and control the current in steppingmotors and similar devices. When used in conjunctionwith the L293, L298, L7150, L6114/L6115,the chip set forms a constant current drive for an inductiveload and performs all the interfacefunctionfrom the con- trol logic thru the power stage. Two or more devices may be synchronized using the sync pin. In this mode of operationthe oscillator in themasterchip sets theoperatingfrequencyin all chips. DIP18 SO20 ORDERING NUMBERS: L6506 L6506D BLOCK DIAGRAM (pin’s number referred to DIP-18)

PIN CONNECTIONS (top view) ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC Supply Voltage 10 V Vi Input Signals 7 V Ptot Total Power Dissipation (Tamb =7 0°C) for DIP18 Total Power Dissipation (Tamb =7 0 É C )for SO20 0.8 W W Tj Junction Temperature 150 °C Tstg Storage Temperature -40 to 150 °C THERMAL DATA Symbol Parameter DIP18 SO20 Unit R th j-amb Thermal Resistance Junction-ambient Max. 80 100 °C/W ELECTRICAL CHARACTERESTICS (VCC = 5.0V, Tamb =2 5°C; unless otherwise noted) Symbol Parameter Test Conditions Min. Typ. Max. Unit VCC Supply Voltage 4.5 7 V ICC Quiescent Supply Current V CC =7 V 2 5 m A DIP18 SO20 COMPARATOR SECTION Symbol Parameter Test Conditions Min. Typ. Max. Unit VIN Input Voltage Range V sense Inputs –0.3 3 V VIO Input Offset Voltage V IN = 1.4V ±5.0 mV IIO Input Offset Current ±200 nA IIB Input Bias Current 1 µA Response time V REF = 1.4V VSENS = 0 to 5V 0.8 1.5 µs L6506 -L6506D

ELECTRICAL CHARACTERISTICS (continued) COMPARATOR SECTION PERFORMANCE (Over OperatingTemperature Range) Symbol Parameter Test Condtions Min. Typ. Max. Unit VIO Input Offset Voltage V IN = 1.4V ±20 mV IIO Input Offset Curent ±500 nA CIRCUIT OPERATION The L6506 is intended for use with dual bridge driv- ers, such as the L298, quaddarlington arrays, such as the L7150, quad DMOS array such as L6114- L6115,or discretepowertransistorsto drivestepper motorsand othersimilar loads.Themain functionof thedeviceis to senseandcontrolthe currentin each of the load windings. A commonon-chiposcillatordrivesthedualchopper and sets the operatingfrequencyfor the pulse width modulated drive. The RC networkon pin 1 sets the operating frequency which is given by the equation 1f = for R > 10 K0.69 RC The oscillator provides pulses to set the two flip- flops which in turn cause the outputsto activatethe drive. When the current in the load winding reaches the programmed peak value, the voltage across the sense resistor (R sense) is equal to Vrefand the cor- respondingcomparator resets its flip-flop interrupt- ingthe drivecurrentuntilthe next oscillatorpulseoc- curs. The peak current in each winding is pro- grammed by selecting the value of the sense resis- tor and V ref. Since separate inputs are provided for each chopper, each of the loads may be pro- grammed independentlyallowing the device to be used to implement microstepping of the motor. Lowerthresholdof L6506’soscillatoris 1/3V CC .U p - per threshold is 2/3 VCC and internal discharge re- sistor is 1 KΩ ± 30 %. Ground noise problems in multiple configurations can be avoided by synchronizing the oscillators. This may be done by connecting the sync pins of each of the devices with the oscillator output of the masterdeviceand connectingthe R/Cpin of the un- used oscillators to ground. The equationsfor the active time of the sync pulse (T2),the inactivetimeof thesyncsignal(T1)and the dutycyclecanbe foundby lookingatthefigure1 and are : R1 RINT2 = 0.69 C1 (1)R1 + RIN T1 = 0.69 R1 C1 (2) T2DC = (3)T1 + T2 LOGIC SECTION (Over Operating Temperature Range - TTL compatible inputs & outputs) Symbol Parameter Test Condtions Min. Typ. Max. Unit VIH Input High Voltage 2 V s V VIL Input Low Voltage 0.8 V VOH Output High Voltage V CC = 4.75V IOH = 400µA 2 3.5 V VOL Ouptut Low Voltage V CC = 4.75V IOH = 4mA 0.25 0.4 V IOH Ouput Source Current - Outputs 1-4 VCC = 4.75V 2.75 mA OSCILLATOR Symbol Parameter Test Condtions Min. Typ. Max. Unit fosc Frequency Range 5 70 KHz VthL Lower Threshold Voltage 0.33 V CC V VthH Higher Threshold Voltage 0.66 V CC V R i Internal Discharge Resistor 0.7 1 1.3 kΩ L6506 - L6506D

Figure 2 :Application Circuit Bipolar Stepper Motor Driver. (pin’s number referred to DIP18) L6506 - L6506D

DIP18 PACKAGE MECHANICAL DATA DIM. mm inch a1 0.254 0.010 B 1.39 1.65 0.055 0.065 b 0.46 0.018 b1 0.25 0.010 D 23.24 0.915 E 8.5 0.335 e 2.54 0.100 e3 20.32 0.800 F 7.1 0.280 I 3.93 0.155 L 3.3 0.130 Z 1.27 1.59 0.050 0.063 L6506 -L6506D

SO20 PACKAGE MECHANICAL DATA DIM. mm inch A 2.65 0.104 a1 0.1 0.3 0.004 0.012 a2 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.013 C 0.5 0.020 c1 45 (typ.) D 12.6 13.0 0.496 0.512 E 10 10.65 0.394 0.419 e 1.27 0.050 e3 11.43 0.450 F 7.4 7.6 0.291 0.299 L 0.5 1.27 0.020 0.050 M 0.75 0.030 S 8 (max.) L6506 - L6506D

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.  1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. L6506 -L6506D