L6219 [STMICROELECTRONICS]
STEPPER MOTOR DRIVER; 步进电机驱动器
| 型号： | L6219 |
| 厂家： | 
ST |
| 描述： | STEPPER MOTOR DRIVER |
| 文件： | 总9页 (文件大小：1496K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L6219
®
STEPPER MOTOR DRIVER
ABLE TO DRIVE BOTH WINDINGS OF BIPO-
LAR STEPPER MOTOR
OUTPUT CURRENT UP TO 750mA EACH
WINDING
WIDE VOLTAGE RANGE 10V TO 46V
HALF-STEP, FULL-STEP AND MICROSTEPP-
ING MODE
BUILT-IN PROTECTION DIODES
INTERNAL PWM CURRENT CONTROL
LOW OUTPUT SATURATION VOLTAGE
DESIGNED FOR UNSTABILIZED MOTOR
SUPPLY VOLTAGE
Powerdip 20+2+2
SO20+2+2
ORDERING NUMBERS:
L6219
L6219DS
INTERNAL THERMAL SHUTDOWN
simultaneous cross conduction during switching
current direction.
An internal pulse-width-modulation (PWM) con-
trols the output current to 750mA with peak start-
up current up to 1A.
DESCRIPTION
The L6219 is a bipolar monolithic integrated cir-
cuits intended to control and drive both winding of
a bipolar stepper motor or bidirectionally control
two DC motors.
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.
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 cur-
rent recirculation.
A cross conduction protection is provided to avoid
BLOCK DIAGRAM
October 2001
1/9
L6219
PIN CONNECTION (Top view)
Powerdip and SO
PIN FUNCTIONS
PDIP &
Name
SO
Function
1;2
OUTPUT A
See pins 5;21
3;23
4;22
SENSE RESISTOR Connection to Lower Emitters of Output Stage for Insertion of Current Sense Resistor
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. 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.
5;21
OUTPUT B
Output Connection. The output stage is a "H" bridge formed by four transistors and
four diodes suitable for switching applications.
6;19
7;18
GROUND
GROUND
See pins 7;18
Ground Connection. With pins 6 and 19 also conducts heat from die to printed circuit
copper.
8;20
9;17
INPUT 0
INPUT 1
See INPUT 1 (pins 9;17)
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
12;14
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).
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
24
V
ss - 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
Parameter
Value
50
Unit
V
VS
Io
Supply Voltage
Output Current (peak)
Output Current (continuous)
Logic Supply Voltage
Logic Input Voltage Range
Sense Output Voltage
Junction Temperature
±1
A
Io
±0.75
7
A
VSS
VIN
Vsense
TJ
V
-0.3 to +7
1.5
V
V
+150
°C
°C
°C
Top
Tstg
Operating Temperature Range
Storage Temperature Range
-20 to +85
-55 to +150
THERMAL DATA
Symbol
Description
PDIP
SO
Unit
Rthj-case
Rthj-amb
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Max.
Max.
14
60 (*)
18
75 (*)
°C/W
°C/W
(*) With minimized copper area.
ELECTRICAL CHARACTERISTICS (Tj = 25°C, VS = 46V, VSS = 4.75V to 5.25V, VREF = 5V; unless oth-
erwise specified) See fig. 3.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
OUTPUT DRIVERS (OUTA or OUTB)
VS
Motor Supply Range
10
46
V
ICEX
Output Leakage Current
VOUT = Vs
OUT = 0
-
-
<1
<-1
50
-50
µA
µA
V
VCE(sat)
Output Saturation Voltage
Sink Driver, IOUT = +500mA
Sink Driver, IOUT = +750mA
Source Driver, IOUT = -500mA
Source Driver, IOUT = -750mA
-
-
-
-
0.3
0.7
1.1
1.3
0.6
1
1.4
1.6
V
V
V
V
IR
Clamp Diode Leakage Current
Clamp Diode Forward Voltage
VR = 50V
-
<1
50
µA
VF
Sink Diode
Source Diode IF =750mA
1
1
1.5
1.5
V
V
IS(on)
IS(off)
Driver Supply Current
Driver Supply Current
Both Bridges ON, No Load
Both Bridges OFF
-
-
8
6
15
10
mA
mA
CONTROL LOGIC
VIN(H)
VIN(L)
IIN(H)
Input Voltage
All Inputs
2.4
-
-
-
V
V
Input Voltage
All Inputs
-
0.8
20
Input Current
VIN = 2.4V
-
-
<1
-3
-
µA
µA
V
IIN(L)
Input Current
VIN = 0.84V
-200
7.5
74
VREF
Reference Voltage
Total Logic Supply Current
Total Logic Supply Current
Operating
1.5
-
ISS(ON)
ISS(OFF)
Io = I1 = 0.8V, No Load
Io = I1 = 2.4V, No Load
64
10
mA
mA
-
14
COMPARATORS
VREF / Vsense Current Limit Threshold (at trip
point
Io = I1 = 0.8V
9.5
13.5
25.5
-
10
15
30
50
1
10.5
16.5
34.5
-
-
-
Io = 2.4V, I1 = 0.8V
Io = 0.8V, I1 = 2.4V
Rt = 56KΩ Ct = 820pF
Fig. 1
µ
s
toff
td
Cutoff Time
µ
s
Turn Off Delay
-
3/9
L6219
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
PROTECTION
TJ
Thermal Shutdown Temperature
-
170
-
°C
Phase
Figure 1
This input determines the direction of current flow
in the windings, depending on the motor connec-
tions. The signal is fed through a Schmidt-trigger
for noise immunity, and through a time delay in
order to guarantee that no short-circuit occurs in
the output stage during phase-shift.
High level on the PHASE input causes the motor
current flow from Out A through the winding to
Out B
Current Sensor
This part contains a current sensing resistor (RS),
a low pass filter (RC, CC) and three comparators.
Only one comparator is active at a time. It is acti-
vated by the input logic according to the current
level chosen with signals Io and I1.
The motor current flows through the sensing re-
sistor RS.
When the current has increased so that the volt-
age across RS becomes higher than the refer-
ence voltage on the other comparator input, the
comparator goes high, which triggers the pulse
generator.
The max peak current Imax can be defined by:
Vref
FUNCTIONAL DESCRIPTION
The circuit is intended to drive both windings of a
bipolar stepper motor.
=
Imax
10 Rs
The peak current control is generated through
switch mode regulation.
Single-pulse Generator
There is a choice of three different current levels
with the two logic inputs I01 - I11 for winding 1 and
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 compo-
nents Rt and Ct.
I
02 - I12 for winding 2.
The current can also be switched off completely
Input Logic (I0 and I1)
The current level in the motor winding is selected
with these inputs. (See fig. 2)
If any of the logic inputs is left open, the circuit will
treat it has a high level input.
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.
I0
H
L
I1
H
H
L
Current Level
No Current
Output Stage
Low current V3 IO max
Medium current 2/3 IO max
Maximum current IO max
The output stage contains four Darlington transis-
tors (source drivers) four saturated transistors
(sink drivers) and eight diodes, connected in two
H bridge.
H
L
L
4/9
L6219
Figure 2: Principle Operating Sequence
The source transistors are used to switch the
power supplied to the motor winding, thus driving
a constant current through the winding.
values are then assumed.
Preferably, VRef should be tracking VSS during
power-on and power-off if VS is established.
It should be noted however, that is not permitted
to short circuit the outputs.
APPLICATION INFORMATIONS (Note 1)
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
Internal circuitry is added in order to increase the
accuracy of the motor current particularly with low
current levels.
VS, VSS, VRef
The circuit will stand any order of turn-on or turn-
off the supply voltages VS and VSS. Normal dV/dt
5/9
L6219
current regulation.
should be kept as short as possible.
Unused inputs should be connected to proper
voltage levels in order to get the highest noise im-
munity.
A typical Application Circuit is shown in Fig. 3.
Note that Ct must be NPO type or similar else.
To sense the winding current, paralleled metal
film resistors are recommended (Rs)
As the circuit operates with switch mode current
regulation, interference generation problems
might arise in some applications. A good measure
might then be to decouple the circuit with a 100nF
capacitor, located near the package between
power line and ground.
Note 1 - Other information is available as "Smart
Power Development System":
Test board HWL6219 (Stepper driver)
Software SWL6219 (Floppy disc)
The ground lead between Rs, and circuit GND
Figure 3: Typical Application Circuit. (Pin out referred to DIP24 package)
6/9
L6219
mm
MIN. TYP. MAX. MIN. TYP. MAX.
4.320 0.170
inch
DIM.
OUTLINE AND
MECHANICAL DATA
A
A1
A2
B
0.380
0.015
3.300
0.130
0.410 0.460 0.510 0.016 0.018 0.020
1.400 1.520 1.650 0.055 0.060 0.065
0.200 0.250 0.300 0.008 0.010 0.012
31.62 31.75 31.88 1.245 1.250 1.255
B1
c
D
E
7.620
8.260 0.300
0.325
e
2.54
0.100
E1
6.350 6.600 6.860 0.250 0.260 0.270
0.300
7.620
e1
L
3.180
3.430 0.125
0.135
Powerdip 24
M
0˚ min, 15˚ max.
E1
A2
A
A1
L
B
B1
e
e1
D
24
1
13
12
c
M
SDIP24L
7/9
L6219
mm
inch
OUTLINE AND
MECHANICAL DATA
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A
A1
A2
B
2.35
0.10
2.65 0.093
0.30 0.004
2.55
0.104
0.012
0.100
0.0200
0.013
0.614
0.299
0.33
0.23
0.51 0.013
0.32 0.009
15.60 0.598
7.60 0.291
C
D
E
15.20
7.40
e
1.27
0,050
H
h
10.0
0.25
10.65 0.394
0.75 0.010
0.419
0.030
k
0° (min.), 8° (max.)
1.27 0.016
SO24
L
0.40
0.050
h x 45˚
A1
K
B
D
e
A1
C
0.10mm
.004
L
H
Seating Plane
24
1
13
12
SO24
8/9
L6219
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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© 2001 STMicroelectronics – Printed in Italy – All Rights Reserved
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