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L9909 Datasheet

  • L9909

  • DC MOTOR DRIVER WITH POSITION CONTROL

  • 9頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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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
BLOCK DIAGRAM
Vcc
Vcc
Current ratio = 1 : 2
MInidip
ORDERING NUMBER:
L9909
1
Vcc
2
| 5 Verr|
COMP7
Td_on
switch on
DELAY
V
R7
=
7.5% Vcc
Tck
START
RES
Tck
TIME OUT
0
150K鈩?/div>
150K
鈩?/div>
1
0 1
+
-
COUN TER
-
+
Vcc
OP1
switch off
D ELAY
Tck
+
COMP1
Td_off
375K鈩?/div>
+
V
R3
=6.6% Vcc
STOP
START
STOP
DIRECTION
PWM
Tck
TEMP.
SENSE
over
temp.
-
V
R4
= 1.5V
+
COMP4
Td_pwm
pwm
DELAY
V
R2
=56.6%Vcc
V
R3
=6.6%Vcc
V
R5
= 6.6% Vcc
Td_ov_2
(1ms)
Vcc
VOLT.
SENSE
over volt.
over volt.
D ELAY2
Td_ov_1
(130碌s)
V
R2
=
56.6% Vcc
V
R3
=
6.6% Vcc
COMP3
Vcc
I
open
open
16V
V
R3
=
6.6% Vcc
LATCH
V
R2
=
56.6% Vcc
I
OP8
I
curr.
sense
DRIVE R
CONTROL
OFF
OFF
Vcc
35V
COMP2
S
FF
R
Tck
over volt.
DELAY 1
curr.
limit
curr.
limit
35V
M+
10V
M-
Q
V
R8
=
+ 14.2% Vcc
Latch
-
7V
OSCILLATOR
IN
curr.
limit
curr.
limit
ROSC
GND
February 2001
1/9

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