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September 2008 Rev 13 1/16

L6219

Stepper motor driver

Features

■ Able to drive both windings of bipolar stepper

motor

■ Output current up to 750 mA each winding

■ Wide voltage range: 10 V to 46 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

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

simultaneous cross conduction during switching

current direction.

An internal pulse-width-modulation (PWM)

controls the output current to 750 mA with peak

startup current up to 1 A.

Wide range of current control from 750 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.

PDIP24 (20+2+2) SO24 (20+2+2)

Table 1. Device summary

Part number Package Packing

E-L6219 PDIP24 Tube

E-L6219DS SO24 Tube

E-L6219DS013TR SO24 Tape & reel

www.st.com

Summary of content (16 pages)

PAGE 1
L6219 Stepper motor driver Features ■ Able to drive both windings of bipolar stepper motor ■ Output current up to 750 mA each winding ■ Wide voltage range: 10 V to 46 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 PDIP24 (20+2+2) A cross conduction protection is provided to avoid simultaneous cross conduction during switc
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Contents L6219 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 Input logic (I0 and I1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3 Current sensor . . . . . . .
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L6219 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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List of figures L6219 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. 4/16 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 SO24/PDIP24 pins connection (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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L6219 Block diagram 1 Block diagram Figure 1. Block diagram Table 2. Absolute maximum rating Parameter Description Value Unit Vs Supply voltage 50 V IO Output current (peak) ±1 A IO Output current (continuous) ±0.75 A Vss Logic supply voltage 7 V Vin Logic input voltage range -0.3 to +7 V Vsense Sense output voltage 1.
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Block diagram L6219 Figure 2. SO24/PDIP24 pins connection (top view) Table 3. Pin functions Pin # Name 1, 2 Output A 3, 23 Sense resistor Connection to lower emitters of output stage for insertion of current sense resistor 4, 22 Comparator input Input connected to the comparators. The voltage across the sense resistor is feedback to this input throught the low pass filter RC CC.
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L6219 Block diagram Table 3. Pin # Name 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).
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Block diagram L6219 Table 5. Electrical characteristcs (Tj = 25 °C, VS = 46 V, VSS = 4.75 V to 5.25 V, VREF = 5 V, unless otherwise specified) See Figure 5 Parameter Description Test condition Min. Typ. Max.
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L6219 2 Functional description Functional description The circuit is intended to drive both windings of a bipolar stepper motor. The peak current control is generated through switch mode regulation. There is a choice of three different current levels with the two logic inputs I01 - I11 for winding 1 and I02 - I12 for winding 2. The current can also be switched off completely. 2.1 Input logic (I0 and I1) The current level in the motor winding is selected with these inputs. (See Figure 4).
PAGE 10
Functional description 2.4 L6219 Single-pulse generator The pulse generator is a monostable triggered on the positive going edge of the comparator output. The monostable output is high during the pulse time, toff, which is determined by the time components Rt and Ct. toff = 1.1 · RtCt The single pulse switches off the power feed to the motor winding, causing the winding current to decrease during toff. If a new trigger signal should occur during toff, it is ignored. 2.
PAGE 11
L6219 Functional description Internal circuitry is added in order to increase the accuracy of the motor current particularly with low current levels. 2.6 VS, VSS, VRef The circuit will stand any order of turn-on or turn-off the supply voltages VS and VSS. Normal dV/dt values are then assumed. Preferably, VRef should be tracking VSS during power-on and power-off if VS is established.
PAGE 12
Application informations 3 L6219 Application informations Some stepper motors are not designed for contin-uous operation at maximum current. As the circuit drives a constant current through the motor, its temperature might increase exceedingly both at low and high speed operation. Also, some stepper motors have such high core losses that they are not suited for switch mode current regulation. Unused inputs should be connected to proper voltage levels in order to get the highest noise immunity.
PAGE 13
L6219 4 Package information Package information In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
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Package information L6219 Figure 7. PDIP24 mechanical data and package dimensions mm DIM. MIN. TYP. A A1 inch MAX. MIN. TYP. 4.320 0.380 A2 0.170 0.015 3.300 0.130 B 0.410 0.460 0.510 0.016 0.018 0.020 B1 1.400 1.520 1.650 0.055 0.060 0.065 c 0.200 0.250 0.300 0.008 0.010 0.012 D 31.62 31.75 31.88 1.245 1.250 1.255 E 7.620 8.260 0.300 e 2.54 E1 6.350 e1 L 6.600 M 0.325 0.100 6.860 0.250 0.260 0.270 0.300 7.620 3.
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L6219 5 Revision history Revision history Table 7. Document revision history Date Revision Changes 30-Oct-2001 7 First Issue on the EDOCS DMS. 11-May-2005 8 Changed the look & feel layout. Modified Table 6 on page 9. 14-Sep-2005 9 Change in the Features sections: Wide voltage range 10 V to 46 V Output current up to 750 mA each winding. 19-Dec-2005 10 Corrected in the Table 5 the max. value of the VREF parameter from 2 V to 7.5 V. 28-Mar-2006 11 Corrected ISS(ON) values in the Table 5.
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L6219 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.