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PDF L9909 Data sheet ( Hoja de datos )
| Número de pieza | L9909 | |
| Descripción | DC MOTOR DRIVER WITH POSITION CONTROL | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® L9909
DC MOTOR DRIVER WITH POSITION CONTROL
DESCRIPTION
Oscillator.
The output current at ROSC pin is mirrored to
COSC pin with a proper direction according to its
voltage slope.
The triangular wave form at COSC pin, being
compared with a threshold, defines the PWM duty
cycle at the motor driver output M+ and M-.
The oscillator also supplies the time base for the
switch off and switch on delays and the Time Out
Counter.
The typical oscillator period is:
Tosc = 7.04 x Rosc x Cosc
MInidip
ORDERING NUMBER: L9909
BLOCK DIAGRAM
V cc
Vcc
Current ratio = 1 : 2
12
Vcc 0 1
150KΩ
01
150KΩ
+-
- + OP1
| 5 Verr|
COMP7
Td_on
switch on
DELAY
+
VR7 =
7.5% Vcc
COUN TER
START
RES
TIME OUT
Vcc
+
COMP1
Td_off
switch off
VR3=6.6% Vcc
START
STOP
-
D ELAY
VR4 = 1.5V
+ COMP4 Td_pwm
pwm
DELAY
STOP
DIRECTION
PWM
VR2=56.6%Vcc
Tck DRIVE R
VR3=6.6%Vcc
VR5 = 6.6% Vcc
TEMP.
SENSE
over
temp.
CONT ROL
OFF
Td_ov_2
( 1ms)
Vcc
VOLT.
over volt.
over volt.
SENSE
D ELAY2
OFF
Vcc
VR2 =
56.6% Vcc
VR3 =
6.6% Vcc
Vcc
COMP2
S
FF
R
COMP3
I
Tck
Td_ov_1
(130 µs)
over volt.
DELAY 1
16V VR2 =
56.6% Vcc
VR3 =
6.6% Vcc
OSCILLATOR
Q
I
OP8 VR8 =
+ 14.2% Vcc
I curr. -
Latch
sense
IN
7V
35V
curr.
limit
open
open
curr.
limit
35V
10V
curr.
limit
curr.
limit
ROSC
GND
M+
M-
February 2001
1/9
1 page  
L9909
Figure 3. L9909 Simplified Application Diagram
Vcc
IFB
VFB
VERR
VCOM
-+
U709
+-
M+
VOUT M
M-
ICOM
Vcc
G ND
Figure 4. Load Dump Transient
starts and the wiper voltage VFB of the feedback
potentiometer moves in the direction of the input
voltage VCOM, bringing the VERR voltage back
to zero.
When VERR becomes lower than (Vcc-VSTP)/10,
a proportional control activates. The motor volt-
age at M+ and M- lowers with a rate factor of 10
times VERR. This motor voltage is generated, ac-
cording to the motor direction, by connecting to
Vcc one motor terminal and by switching the op-
posite one with a PWM control.
When approaching the target position, at
VERR=0, the motor jumps into the Rest Zone
from a residual VSTP supply voltage. This control
Figure 5. Inductive Switching Transient - Positive
Vcc
90%
Vs
10%
T
tr
Vs = 60V
Source resistance = 0.5 Ω
1ms < tr < 10ms
T = 400ms
t1 = 10s
Time
Position Feedback.
As shown in Figs. 3 and 6, a positive error voltage
VERR = VCOM - VFBK drives the motor with a
positive M+ voltage with respect to M-. A correct
negative electro-mechanical feedback is estab-
lished when the motor, supplied with a positive
M+ voltage with respect to M-, drives the feed-
back potentiometerwiper to Vcc.
Rest Zone.
When the differential input voltage VERR crosses
the zero Volts threshold, as detected by the preci-
sion comparator COMP1, the motor is braked by
driving it with a zero Volts voltage.
As long as VERR is kept inside the Rest Zone,
ranging from -VSTR to +VSTR (see Figs. 1 and
2), no electrical stimulus is applied to the motor
terminals. When in the Rest Zone M+ and M- are
both driven to Vcc.
Running Zone.
When the input error voltage VERR goes out of
the Rest Zone (see Figs. 1 and 2) the motor
Vcc
90%
Vs
t1
T
tr
10%
Vs = 100V
Source resistance = 10 Ω
tr = 1µs
Time
T = 200µs to 500µs
t1 = 200ms to 500ms
is suitable for motors that still run with the min.
VSTP=2.5V residual supply voltage in all condi-
tions, ensuring that the rest position is finally
reached. But at the same time the max.
VSTP=3.5V should not make any motor run too
fast and stop far away from the set point for me-
chanical inertia, or even get out of the rest zone
possibly starting oscillations.
Time Out Counter.
The Time Out is performed by a 14 Bit Counter
that counts 16384 Tosc periods. When the input
error voltage VERR goes out of the Rest Zone the
motor and the counter start. The motor stops at
the VERR zero crossing or when the Counter
times out, whichever comes first.
Direction Control.
The motor can be driven in both direction and
stopped by the timer as shown in Fig. 7.
The bias voltage at VFB input sets the threshold
voltage for the direction control input pin (DIR).
VFB and VCOM inputs may be swapped causing
the motor to reverse directions.
5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet L9909.PDF ] | |
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