E-L6219R

L6219R Stepper motor driver Features ■ Able to drive both windings of bipolar stepper motor ■ Output current up to 500 mA each winding ■ Wide voltage range 4.5 V to 10 V ■ 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 SO-24 (20+2+2) A cross conduction protection is provided to avoid simultaneous cross conduction during switching current direction. Description The L6219R 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 L6219R 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 10 V and including four diodes for current recirculation. Table 1. An internal pulse-width-modulation (PWM) controls the output current to 500mA with peak start-up current up to 1 A. Wide range of current control from 500 mA (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. Device summary Part number Package Packing L6219R SO-24 Tube L6219R013TR SO-24 Tape & reel SO-24 Tube SO-24 Tape & reel E-L6219R(1) E-L6219R013TR (1) 1. Lead free package (ECOPACK®) see Chapter 5. September 2008 Rev 4 1/16 www.st.com 1 Table of contents L6219R Table of contents 1 Block diagram and pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 4 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 Input logic (I0 and I1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Current sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.4 Single-pulse generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.5 Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.6 VS, VSS, VRef . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Application informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 Package informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 L6219R List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Input logic current level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3/16 List of figures L6219R List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. 4/16 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Windings of a bipolar stepper motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Principle operating sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Typical application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Maximum output current vs. supply voltage (DAC=100%) . . . . . . . . . . . . . . . . . . . . . . . . . 13 Maximum reference voltages vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Maximum output current vs. reference voltage (DAC=100%) . . . . . . . . . . . . . . . . . . . . . . 13 SO-24 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 L6219R 1 Block diagram and pins description Block diagram and pins description Figure 1. Block diagram Figure 2. Pin connection (top view) 5/16 Block diagram and pins description Table 2. Note: 6/16 L6219R Pin description Pin # Name 1,2 Output A 3,23 Sense resistor Description See pins 5,21 Connection to lower emitters of output stage for insertion of current sense resistor Input connected to the comparators. The voltage across the sense resistor is 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 Figure 4 4,22 Comparator input 5,21 Output B 6,19 Ground See pins 7,18 7,18 Ground Ground connection. With pins 6 and 19 also conducts heat from die to printed circuit copper 8,20 Input 0 See input 1 (pins 9,17) 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 10,16 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 11,15 Reference voltage A voltage applied to this pin sets the reference voltage of the comparators, this determining the output current (also thus depending on Rs and the two inputs input 0 and input 1) 12,14 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) 13 Vss - Logic supply 24 Vs - Load supply Output connection. The output stage is a H bridge formed by four transistors and four diodes suitable for switching applications Supply voltage input for logic circuitry Supply voltage input for the output stages ESD on GND, Vs, Vss, OUT 1 A and OUT 2 A is guaranteed up to 1.5 KV (human body model, 1500 W, 100 pF). L6219R Electrical specifications 2 Electrical specifications 2.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol 2.2 Parameter Value Unit VS Supply voltage 30 V Io Output current (peak) ±1 A Io Output current (continuous) ±0.5 A 7 V -0.3 to VSS V VSS Logic supply voltage VIN Logic input voltage range Vsense Sense output voltage 1.5 V TJ Junction temperature +150 °C Top Operating temperature range -20 to +85 °C Tstg Storage temperature range -55 to +150 °C Thermal data Table 4. Thermal data Symbol Rthj-case Rthj-amb Description Thermal resistance junction-case Thermal resistance junction-ambient Max. Max. Value Unit 18 75 (1) °C/W °C/W 1. With minimized copper area. 7/16 Electrical specifications L6219R 2.3 Electrical characteristics Table 5. Electrical characteristics (Tj = 25 °C, VS = 4.5 V, VSS = 4.75 V to 5.25 V, VREF = 2 V, unless otherwise specified) See Figure 5. . Symbol Parameter Test Condition Min. Typ. Max. Unit 10 V OUTPUT DRIVERS (OUTA or OUTB) VS ICEX VCE(sat) Motor supply range Output leakage current Output saturation voltage 4.5 Vs = 30 V, VOUT = Vs, Vs = 30 V, VOUT = 0 -50