L6219D

® L6219 STEPPER MOTOR DRIVER ABLE TO DRIVE BOTH WINDINGS OF BIPOLAR STEPPER MOTOR OUTPUT CURRENT UP TO 750mA EACH WINDING WIDE VOLTAGE RANGE 10V TO 46V HALF-STEP, FULL-STEP AND MICROSTEPPING MODE BUILT-IN PROTECTION DIODES INTERNAL PWM CURRENT CONTROL LOW OUTPUT SATURATION VOLTAGE DESIGNED FOR UNSTABILIZED MOTOR SUPPLY VOLTAGE INTERNAL THERMAL SHUTDOWN DESCRIPTION The L6219 is a bipolar monolithic integrated circuits intended to control and drive both winding of a bipolar stepper motor or bidirectionally control two DC motors. The L6219 with a few external components form a complete control and drive circuit for LS-TTL or microprocessor controlled stepper motor system. The power stage is a dual full bridge capable of sustaining 46V and including four diodes for current recirculation. A cross conduction protection is provided to avoid BLOCK DIAGRAM Powerdip 20+2+2 SO20+2+2 ORDERING NUMBERS: L6219 L6219DS simultaneous cross conduction during switching current direction. An internal pulse-width-modulation (PWM) controls the output current to 750mA with peak startup current up to 1A. Wide range of current control from 750mA (each bridge) is permitted by means of two logic inputs and an external voltage reference. A phase input to each bridge determines the load current direction. A thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits. October 2001 1/9 L6219 PIN CONNECTION (Top view) Powerdip and SO PIN FUNCTIONS PDIP & SO 1;2 3;23 4;22 Name Function 5;21 6;19 7;18 8;20 9;17 10;16 11;15 12;14 13 24 OUTPUT A See pins 5;21 SENSE RESISTOR Connection to Lower Emitters of Output Stage for Insertion of Current Sense Resistor COMPARATOR Input connected to the comparators. The voltage across the sense resistor is INPUT feedback to this input throught the low pass filter RC CC. The higher power transistors are disabled when the sense voltage exceeds the reference voltage of the selected comparator. When this occurs the current decays for a time set by RT CT (toff = 1.1 RT CT). See fig. 1. OUTPUT B Output Connection. The output stage is a "H" bridge formed by four transistors and four diodes suitable for switching applications. GROUND See pins 7;18 GROUND Ground Connection. With pins 6 and 19 also conducts heat from die to printed circuit copper. INPUT 0 See INPUT 1 (pins 9;17) INPUT 1 These pins and pins 8;20 (INPUT 0) are logic inputs which select the outputs of the comparators to set the current level. Current also depends on the sensing resistor and reference voltage. See Funcional Description. PHASE This TTL-compatible logic inputs sets the direction of current flow through the load. A high level causes current to flow from OUTPUT A (source) to OUTPUT B (sink). A schmitt trigger on this input provides good noise immunity and a delay circuit prevents output stage short circuits during switching. REFERENCE A voltage applied to this pin sets the reference voltage of the comparators, this VOLTAGE determining the output current (also thus depending on R s and the two inputs INPUT 0 and INPUT 1). RC A parallel RC network connected to this pin sets the OFF time of the higher power transistors. The pulse generator is a monostable triggered by the output of the comparators (toff = 1.1 RT CT). Vss - LOGIC SUPPLY Supply Voltage Input for Logic Circuitry Vs - LOAD SUPPLY Supply Voltage Input for the Output Stages. Note: ESD on GND, VS, VSS, OUT 1A and OUT 2A is guaranteed up to 1.5KV (Human Body Model, 1500Ω, 100pF). 2/9 L6219 ABSOLUTE MAXIMUM RATINGS Symbol VS Io Io VSS VIN Vsense TJ Top Tstg Supply Voltage Output Current (peak) Output Current (continuous) Logic Supply Voltage Logic Input Voltage Range Sense Output Voltage Junction Temperature Operating Temperature Range Storage Temperature Range Parameter Value 50 ±1 ±0.75 7 -0.3 to +7 1.5 +150 -20 to +85 -55 to +150 Unit V A A V V V °C °C °C THERMAL DATA Symbol Rthj-case Rthj-amb Description Thermal Resistance Junction-case Thermal Resistance Junction-ambient Max. Max. PDIP 14 60 (*) SO 18 75 (*) Unit °C/W °C/W (*) With minimized copper area. ELECTRICAL CHARACTERISTICS (Tj = 25°C, VS = 46V, VSS = 4.75V to 5.25V, VREF = 5V; unless otherwise specified) See fig. 3. Symbol Parameter Test Condition Min. Typ. Max. Unit OUTPUT DRIVERS (OUTA or OUTB) VS ICEX VCE(sat) Motor Supply Range Output Leakage Current Output Saturation Voltage 10 VOUT = Vs VOUT = 0 Sink Driver, IOUT = +500mA Sink Driver, IOUT = +750mA Source Driver, IOUT = -500mA Source Driver, IOUT = -750mA VR = 50V Sink Diode Source Diode IF =750mA Both Bridges ON, No Load Both Bridges OFF