L6219D

Manufacturer Part NumberL6219D
DescriptionSTEPPER MOTOR DRIVER
ManufacturerSTMicroelectronics
L6219D datasheet
 


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FUNCTIONAL DESCRIPTION

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L6219
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
PROTECTION
T
Thermal Shutdown Temperature
J
Figure 1

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 I
- I
01
11
I
- I
for winding 2.
02
12
The current can also be switched off completely
Input Logic (I
and I
)
0
1
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.
I
I
Current Level
0
1
H
H
No Current
L
H
Low current V
H
L
Medium current 2/3 I
L
L
Maximum current I
4/9
Test Condition
Phase
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 (R
a low pass filter (R
Only one comparator is active at a time. It is acti-
vated by the input logic according to the current
level chosen with signals I
The motor current flows through the sensing re-
sistor R
.
S
When the current has increased so that the volt-
age across R
ence voltage on the other comparator input, the
comparator goes high, which triggers the pulse
generator.
The max peak current I
Single-pulse Generator
The pulse generator is a monostable triggered on
for winding 1 and
the positive going edge of the comparator output.
The monostable output is high during the pulse
time, t
, which is determined by the time compo-
off
nents R
and C
t
The single pulse switches off the power feed to
the motor winding, causing the winding current to
decrease during t
If a new trigger signal should occur during t
ignored.
Output Stage
I
max
3
O
The output stage contains four Darlington transis-
max
O
tors (source drivers) four saturated transistors
max
(sink drivers) and eight diodes, connected in two
O
H bridge.
Min.
Typ.
Max.
Unit
-
170
-
°C
, C
) and three comparators.
C
C
and I
.
o
1
becomes higher than the refer-
S
can be defined by:
max
V
ref
I
max
10 R
s
.
t
t
= 1.1
R
C
off
t
t
.
off
, it is
off
),
S