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參數(shù)資料
| 型號： | L9639 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | FOLDER ACTUATOR |
| 中文描述： | 折邊動器 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 45K |
| 代理商： | L9639 |
DESCRIPTION
This device typically drives a direct current motor
servomechanismproviding two extreme end posi-
tions and replaces end position switches or sen-
sors.
For more details see the Timing diagram (Fig. 1)
and the Applicationdiagram (Fig. 2)
When the power supply is applied, or its polarity
is inverted the motor is powered up (start point).
The current of the motor reaches the start up
value near to the stall current, always higher than
the threshold value of the device (I
TH
) . A delay
on the detection (T
D
) permits the motor start up
and the consequentdecrease of the current.
During the free running phase, the current in the
motor must always be lower the threshold I
TH
.
When the motor reaches the end of the run limit,
the current increases reaching a value that, de-
pending on the application, can be the stall value
or can depend on some torque limiting friction
(end point). Provided that this value is higher the
programmed threshold I
TH
, the motor is stopped
after a time delay T
D
, and the device goes into a
low consumption standby status, ready to restart
the motor for a new cycle if the polarity of the
power supply is inverted (or power is switched off
and on).
In any case, if the current exceeds the higher
thresholdI
THCC
, themotor is immediately stopped
because a short circuit is detected. The delay T
D
also permits the motor to overcome some small
obstacleduring the free run.
The thresholdcurrent for the runningphase I
TH
is
obtained by comparingthe voltage on an external
sensing resistor (R
SHUNT
) to a threshold voltage
V
TH
.
1) I
TH
= V
TH
/ R
SHUNT
V
TH
is constant in respect to the power supply
voltage because in most applications, the end of
run current is depending only on motor and the
mechanictorque limiting device (friction current).
The threshold current for the short circuit detec-
tionis:
2) I
THCC
= V
THCC
/R
SHUNT
@V
THCC
= 330mV@
V
bat
= 12V
and depends intentionally on the supply voltage
because of the same dependenceof the stall cur-
rent. The time T
D
depends on two external com-
ponents, capacitor C
EX
and resistor R
EX
. TD is
obtained by the following expression:
T
D
= R
EX
R
EX
K
TD
K
TD
is a constanttypicallyof unitvalue.
The block diagram is shown on the first page.
The change of the polarity between pins COM-
MON and LIVE, needs the active bridge to supply
the internal circuit. The internal supply voltage is
available between pins V+ and GND and a stor-
age and filter capacitor (100nF) must be con-
nected between these pins. The output stage
ELECTRICALCHARACTERISTICS
(Refer to the test circuit, unless otherwise specified.)
Symbol
V
bat
I
q
I
ref
Parameter
Test Condition
Min.
8
Typ.
Max.
17
200
135
Unit
V
μ
A
μ
A
Power supply
Quiescent current
Current ref. threshold for start
and end current(note 1)
Current ref. threshold for short
circuit current det (note 2)
Stanby
V
bat
= 8 to 17V
100
100
70
I
refcc
Vbat = 8V
V
bat
= 12V
V
bat
= 17V
240
300
400
8
300
440
550
400
560
690
μ
A
I
sc1
T
dsc
R
on
R
ona
R
load
Current short circuit limit
Short circuit time delay
R
on
output power DMOS
R
on
active bridge DMOS
Open load detector max. load
resistance
Delay constant (note3)
Immunitydebouncer switch
A
μ
s
I
load
> I
thcc
I
load
= 1.2A
V
bat
= 8V, I
gnd
= 1A
100
1
0.7
200
0.6
Ohm
Ohm
Ohm
K
td
Deb
1
V
bat
= pulse
Note 1: I
th
=
R_ref
R
shunt
I
ref
Note 2: I
thcc
=
R_ref
R
shunt
I
refcc
V
th_high
V
th_low
Note 3: T
d
=
In
Rex
Cex
=
Rex
Cex
Ktd
L9639
3/6
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