L8219P [STMICROELECTRONICS]
STEPPER MOTOR CONTROLLER, 2.5A, PDSO36, POWER, SO-36;
| 型号： | L8219P |
| 厂家： | 
ST |
| 描述： | STEPPER MOTOR CONTROLLER, 2.5A, PDSO36, POWER, SO-36 电动机控制 光电二极管 |
| 文件： | 总13页 (文件大小：159K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L8219
HIGH CURRENT STEPPER MOTOR DRIVER
PRODUCT PREVIEW
■ IMPROVED STEP ANGLE SPLITTING &
TORQUE
■ ABLE TO DRIVE BOTH WINDINGS OF
BIPOLAR STEPPER MOTOR
■ OUTPUT CURRENT UP TO 1.5A EACH
WINDING
■ WIDE VOLTAGE RANGE 10V TO 46V
■ HALF-STEP, FULL-STEP AND MICROSTEPP-
ING MODE
SO28EP
ORDERING NUMBERS:
L8219LP
PowerSO36
L8219P
tors.The L8219 with a few external components form
a complete control and drive circuit for LS-TTL or mi-
croprocessor controlled stepper motor system.The
power stage is a dual full bridge capable of sustaining
46V and including four diodes for current recircula-
tion.A cross conduction protection is provided to
avoid simultaneous cross conduction during switch-
ing current direction.An internal pulse-width-modula-
tion (PWM) controls the output current to 1.5A with
peak start-up current up to 1.75A.Wide range of cur-
rent control from 1.5A (each bridge) is permitted by
means of two logic inputs and an external voltage ref-
erence. 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.
■ BUILT-IN PROTECTION DIODES
■ INTERNAL PWM CURRENT CONTROL
■ LOW OUTPUT SATURATION VOLTAGE
■ DESIGNED FOR UNSTABILIZED MOTOR
SUPPLY VOLTAGE
■ INTERNAL THERMAL SHUTDOWN
■ TWO POWER PACKAGES ARE AVAILABLE:
- SO28EP Exposed Pad
- PowerSO36
DESCRIPTION
The L8219 is a bipolar monolithic integrated circuits
intended to control and drive both winding of a bipolar
stepper motor or bidirectionally control two DC mo-
BLOCK DIAGRAM
COMPINP1
R C
1
PH1
EN1
V
V
S1
1
SS
OUT1A
OUT1B
I
I
01
11
+
2bit
DAC
WINDING
1
LOGIC
-
V
REF1
R
C
R
V
S1
C
C
THERMAL
S2
SHUTDOWN
OUT2A
I
I
02
12
-
2bit
DAC
WINDING
2
LOGIC
+
V
REF2
OUT2B
C
C
R
C
D99IN1075A
COMPINP2
R C
2
PH2
EN2
R
S2
2
August 2002
1/13
This is preliminary information on a new product now in development. Details are subject to change without notice.
L8219
PINS CONNECTIONS (Top views)
OUT2B
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
OUT1B
R
2
R
S1
S2
GND
OUT2A
COMPINP2
VS2
3
GND
OUT1A
N.C.
4
5
6
COMPINP1
VS1
GND
7
SO28EP
EN2
8
GND
EN1
I02
9
I12
10
11
12
13
14
I01
PH2
I11
VREF2
PH1
R C
VREF1
2
2
VSS
R C
1
1
D99IN1074A
1
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
VS1
COMPINP1
N.C.
GND
EN1
N.C.
N.C.
I01
2
3
4
N.C.
5
N.C.
6
OUT1A
GND
I11
7
PH1
VREF1
8
R
S1
9
OUT1B
OUT2B
R C
1 1
PowerSO36
10
11
12
13
14
15
16
17
18
VSS
R C
R
S2
2
2
GND
OUT2A
N.C.
VREF2
PH2
I12
N.C.
I02
N.C.
N.C.
EN2
GND
COMPINP2
VS2
D99IN1073A
2/13
L8219
PIN FUNCTION
SO28
PowerSO36
Name
Description
EP
1
10
OUT2B Bridge-2
Ouput connection. The output stage is a "H" bridge formed by four transistors and
four diodes connected to ground suitable for switching applications.
2
11
Rs2
Bridge-2
Power stage sink transistors emitter connection.Sensing resistor is connected from
this pin and ground.
3
4
5
12
13
17
GND2 Ground
OUT2A same as OUT2B
COMPI Bridge-2
MP2
An internal low pass filter RcCc is integrated.
6
7, 21
8
18
19,36
20
Vs2
Bridge-2 Power supply voltage.
Ground
GND
EN2
Bridge2
When the enable input is set high the bridge is immediately switched-off skipping the
delay time of the current control loop turning-off (I0=I1=H)
9
22
I02
Bridge-2
Logic input to set up the output current level, which is also determined by the
sensing resistor and reference voltage(see also Functional description and table 1).
10
11
23
24
I12
same as I02 (see table 1)
PH2
Bridge-2
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.
12
13
25
26
Vref2
R2C2
Bridge-2
A voltage applied to this pin sets the reference voltage of the comparators, this
determinig the output current (also depending on Rs and the the two inputs INPUT 0
and INPUT 1).
Bridge-2
An external RC network connected to this pin sets the toff time of the higher power
transistors.The pulse generator is a monostable triggerd by the output of the
comparators (toff = 1.1 RTCT)
14
15
16
17
18
19
20
22
23
27
28
29
30
31
32
35
1
Vss
R1C1
Vref1
PH1
I11
Supply voltage input for the logic circuitry.
Bridge-1 same as R2C2.
Bridge-1 same as Vref2
Bridge-1 same as PH2
Bridge-1 same as I12
I01
Bridge-1 same as I02
EN1
Vs1
Bridge-1 same as EN2
Bridge-1 Power supply voltage.
2
COMPINP1 Bridge-1
An internal low pass filter RcCc is integrated. Another RC external network will
modify the blanking time (ss Functional Description)
24
25
3,4,5,14,15,
16,21,33,34
N.C.
Not connected
6
OUT1A Bridge-1
Output connection. The output stage is a "H" bridge formed by four transistors and
four diodes connected to ground suitable for switching applications
26
27
7
8
GND
RS1
Ground.
Bridge-1
Power stage sink transistors emitter connection.Sensing resistor is connected from
this pin and ground.
28
9
OUT1B same as OUT1A
3/13
L8219
THERMAL CHARACTERISTICS - SO28EP
Power Dissipated T Ambient Thermal J-A resistance
Conditions
(W)
(˚C)
(˚C/W)
4.4
70
18
pad layout + ground layers + 16 via hol
PCB ref.: 4 LAYER cm 12 x 12
3.5
2.1
70
70
23
38
pad layout + ground layers
PCB ref.: 4 LAYER cm 12 x 12
pad layout + 6cm2 on board heat sink
PCB ref.: 2 LAYER cm 12 x 12
D02IN1372
10
8
6
4
2
0
18˚C/W
23˚C/W
38˚C/W
0
20
40
60
80
100
120
140
160
D02IN1373
Ambient Temperature (˚C)
4/13
L8219
THERMAL CHARACTERISTICS - PowerSO36
Power Dissipated T Ambient Thermal J-A resistance
Conditions
(W)
(˚C)
(˚C/W)
5.3
70
15
pad layout + ground layers + 16 via hol
PCB ref.: 4 LAYER cm 12 x 12
4.0
2.3
70
70
20
35
pad layout + ground layers
PCB ref.: 4 LAYER cm 12 x 12
pad layout + 6cm2 on board heat sink
PCB ref.: 2 LAYER cm 12 x 12
D02IN1370
12
10
8
15˚C/W
20˚C/W
6
35˚C/W
4
2
0
0
20
40
60
80
100
120
140
160
D02IN1371
Ambient Temperature (˚C)
5/13
L8219
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
50
Unit
V
V
S
Supply Voltage
I
I
Output Current (peak) non repetitive ton < 2µs
Output Current repetitive ton < 10µs
Logic Supply Voltage
2.5
A
o
1.75
A
o
V
SS
7
V
V
Logic Input Voltage Range
Sense Output Voltage
-0.3 to +7
1.5
V
IN
V
V
sense
T
Junction Temperature
+150
°C
°C
°C
J
T
op
Operating Temperature Range
Storage Temperature Range
0 to 70
-55 to +150
T
stg
ELECTRICAL CHARACTERISTICS (T = 25°C, V = 46V, V = 4.75V to 5.25V, V = 5V; unless otherwise
REF
j
S
SS
specified) See fig. 3.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
OUTPUT DRIVERS (OUT or OUTB)
A
V
S
Motor Supply Range
10
46
V
I
Output Leakage Current
V
V
= V
= 0
-
-
<1
<-1
100
-100
µA
µA
CEX
OUT
OUT
s
V
Output Saturation Voltage
Sink Driver, I
Sink Driver, I
Source Driver, I
Source Driver, I
= +1A
-
-
-
-
0.5
0.8
1.8
1.9
0.7
1
1.9
2.1
V
V
V
V
CE(sat)
OUT
= +1.5A
OUT
= -1A
= -1.5A
OUT
OUT
I
Clamp Diode Leakage Current
Clamp Diode Forward Voltage
V
= 50V
R
-
<1
50
µA
R
V
Sink Diode
Source Diode I =1.5A
1.6
1.6
2
2
V
V
F
F
I
Driver Supply Current
Driver Supply Current
Both Bridges ON, No Load
Both Bridges OFF
-
-
8
6
20
15
mA
mA
S(on)
S(off)
I
CONTROL LOGIC
V
Input Voltage
All Inputs
All Inputs
2.4
-
-
-
V
IN(H)
V
Input Voltage
-
0.8
20
V
IN(L)
IN(H)
I
Input Current
V
V
= 2.4V
-
<1
-3
-
mA
mA
V
IN
IN
I
Input Current
= 0.84V
-
1.5
-
-200
7.5
120
20
IN(L)
V
Reference Voltage
Total Logic Supply Current
Total Logic Supply Current
Operating
I = I = 0.8V, No Load
REF
I
90
14
mA
mA
SS(ON)
o
1
I
I = I = 2.4V, No Load
-
SS(OFF)
o
1
COMPARATORS
Current Limit Threshold (at trip
V
/
I = I = 0.8V
9.5
12.7
20.7
-
10
14.1
24.4
50
10.5
15.6
28.1
-
-
REF
o
1
point
V
sense
I = 2.4V, I = 0.8V
o
1
I = 0.8V, I = 2.4V
-
o
1
t
Cutoff Time
R = 56KΩ C = 820pF
µs
µs
off
t
t
t
Turn Off Delay
Fig. 1
-
1
d
PROTECTION
Thermal Shutdown Temperature
T
-
170
-
°C
J
6/13
L8219
FUNCTIONAL DESCRIPTION
One L8219 is able to drive both windings of a bipolar stepper motor. Internal PWM control circuit sets the current
in each motor's winding. The peak current in each winding is sensed and then controlled by an external sensing
resistor (Rs), a reference voltage (Vref), and the 2 bit DAC. In addition, varying the Vref voltage can be provided
a continous control of the peak load current fitting micro-stepping application needs.
Logic (I and I )
0
1
The current level in each motor winding is selected with two digital inputs. (See tab.1) producing four current
Imax, 70.7%Imax, 41%Imax and zero current.
Eight step position can be produced at constant torque setting an Half-step mode and selecting 100% current
when only one phase is ON and 70.7% when two phases are ON.
When the "Phase" signal change or when I =I =H the power bridge is turned off resulting in a fast current decay
0
1
(see fig.1) through the internal output clamp and flyback diodes. The fast current decay is usefull for half-step
and high speed application. If any of the logic inputs is left open, the circuit will treat it as a high level input. Due
to the internal current control loop (sensing resistor, comparator, monostable) a delay time of ~2
tween the input of the digital comand and the real current implementation in the motor's winding. When the dig-
ital inputs are set to zero (I =I =L) the average current will be higher then zero for a time period of ~2 sec; to
µsec exsist be-
µ
0
1
skip this problem there is the pin "Enable" which immediately turn off the bridge.
With the I and I digital input signals is also possible to implement the "holding torque" (reduced power dissi-
0
1
pation), or the best "start-up" condition (maximum output current).
Io
I1
Current Leve
H
L
H
L
H
H
L
0% Current
41% Current
70.7% Current
100% Current
L
Figure 1.
VBB
DRIVE CURRENT
RECIRCULATION
(SLOW-DECAY MODE)
RECIRCULATION
(FAST-DECAY MODE)
RS
D99IN1004
Internal PWM Current Control
Once an output current level has been set by the digital input the current in the motor winding begins to flow in
the bridge (see fig.1) and the max peak current Imax can be defined by: Imax = Vref10 Rs. At the same time
the voltage on sensing resistor increase and the bridge will be turned off again as soon as the voltage on the
sensing resistor is equal to the value set by the DAC; at this stage the current recirculates through the ground-
clamp diodes and sink transistor implementing the slow current decay.
Once the "toff" time has expired the source driver is turned on again and the cycle repeat itself keeping the de-
sidered average current level.
7/13
L8219
Figure 2.
VOUTA-VOUTB or VOUTB-VOUTA
(EACH WINDING)
toff =1·1 RtCt
1
fs =
normalized
1
ton + toff
ton
1/2
toff
td
Vsense
Vref
ton
toff
D99IN1019
Figure 3. Principle Operating Sequence
STAND BY WITH
HALFSTEP MOTOR DRIVE
FULL STEP
HOLDING TORQUE
MOTOR DRIVE
Im=41%
Im=70.7%
Im=100%
1
2 3 4 5 6 7 8
I01
I11
Ph1
Ph2
I02
I12
MOTOR CURRENT PHASE 1
Imax
-Imax
Imax
MOTOR CURRENT PHASE 2
-Imax
D99IN1020A
8/13
L8219
Phase
This input determines the direction of current flow in the windings, depending on the motor connections. The
signal is fed through a Schmidt-trigge 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 (R ), a low pass filter (R , C ) and three comparators.Only one
S
C
C
comparator is active at a time. It is activated by the input logic according to the current level chosen with signals
I and I .
0
1
The motor current flows through the sensing resistor R . When the current has increased so that the voltage
S
across R becomes higher than the reference voltage on the other comparator input, the comparator goes high,
S
which triggers the pulse generator.
The max peak current Imax can be defined by:
V
ref
I
= ----------------
max
10 R
S
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, t , which is determined by the time components R and C .
off
t
t
t
= 1.1 · R C
t t
off
The single pulse switches off the power feed to the motor winding, causing the winding current to decrease dur-
ing t
.
off
If a new trigger signal should occur during t , it is ignored.
off
Output Stage
The output stage contains four Darlington transistors (source drivers) four saturated transistors (sink drivers)
and eight diodes, connected in two H bridge. The source transistors are used to switch the power supplied to
the motor winding, thus driving a constant current through the winding.
V , V , V
S
SS Ref
The circuit will stand any order of turn-on or turn-off the supply voltages V and V . Normal dV/dt values are
S
SS
then assumed. Preferably, V
should be tracking V during power-on and power-off if V is established.
SS S
Ref
Thermal Shutdown
When the die temperature reach 170°C the thermal shutdown internal circuitry turns off the power stage
(tristate), once the cause of the die increased temperature will be removed the L8219 re-turns on itself as soon
as the die temperature reach 150°C.
APPLICATION INFORMATIONS
Some stepper motors are not designed for continuous operation at maximum current. As the circuit drives a con-
stant current through the motor, its temperature might increase exceedingly both at low and high speed opera-
tion. 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 immu-
nity. 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. The ground lead between Rs, and circuit GND should be kept as
short as possible. A typical Application Circuit is shown in Fig. 4. Note that Ct must be NPO type or similar else.
To sense the winding current, paralleled metal film resistors are recommended.
9/13
L8219
Figure 4. Typical Application Circuit.
V
=5V
V
S
SS
100nF
100nF
100µF
OUT1
OUT2
I01
I11
Ph1
Ph2
I12
M
I02
RS 0.5Ω
R
S1
R C
1
1
820pF
Ct
56K
Rt
toff
56K
Rt
C
R
I
OMP NP1
820pF
Ct
R C
2
2
RS 0.5Ω
S2
C
I
OMP NP2
D99IN1021A
10/13
L8219
mm
inch
DIM.
OUTLINE AND
MECHANICAL DATA
MIN.
2.350
0.100
2.050
0.330
0.230
17.70
TYP. MAX. MIN.
2.650 0.092
0.300 0.004
2.550 0.080
0.510 0.013
0.320 0.009
18.10 0.696
TYP. MAX.
0.104
A
A1
A2
b
0.012
0.100
0.020
c
00.12
(1)
0.712
D
D1
ACCORDING TO PAD SIZE
7.600 0.291
(2)
7.400
0.299
E
E1
e
ACCORDING TO PAD SIZE
1.270
0.05
H
10.00
0.250
0.400
10.65 0.394
0.750 0.010
1.270 0.016
0˚ (min), 8˚ (max)
0.100
0.419
0.029
0.05
h
L
k
ddd
0.004
(1) Dimensions “D” does not include mold flash, protusions or gate burrs.
Mold flash, protusions and gate shall not exeed 0.15mm per side
(2) Dimensions “E” does not include inter-lead flash or protusions or
gate burrs. Inter-lead flash or protusions shall not exeed 0.25mm
SO28EP
(HSOP28 - Exposed Pad)
.
per side
.
7165357
11/13
L8219
mm
inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
OUTLINE AND
MECHANICAL DATA
A
a1
a2
a3
b
3.60
0.141
0.012
0.130
0.004
0.015
0.012
0.630
0.385
0.570
0.10
0.30 0.004
3.30
0
0.10
0
0.22
0.23
0.38 0.008
0.32 0.009
16.00 0.622
9.80 0.370
14.50 0.547
c
D (1) 15.80
D1
E
9.40
13.90
e
0.65
0.0256
0.435
e3
11.05
E1 (1) 10.90
E2
11.10 0.429
2.90
0.437
0.114
0.244
0.126
0.004
0.626
0.043
0.043
E3
E4
G
H
5.80
2.90
0
6.20 0.228
3.20 0.114
0.10
0
15.50
15.90 0.610
1.10
h
L
0.80
1.10 0.031
10°(max.)
8 °(max.)
N
S
PowerSO36
(1): "D" and "E1" do not include mold flash or protrusions
- Mold flash or protrusions shall not exceed 0.15mm (0.006 inch)
- Critical dimensions are "a3", "E" and "G".
N
N
a2
A
c
a1
e
A
DETAIL B
lead
E
DETAIL A
e3
H
DETAIL A
D
slug
a3
BOTTOM VIEW
36
19
E3
B
E1
E2
D1
DETAIL B
0.35
Gage Plane
- C -
SEATING PLANE
1
1
8
S
L
G
C
M
b
0.12
A B
PSO36MEC
h x 45˚
(COPLANARITY)
12/13
L8219
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. Specifications 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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13/13
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