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參數(shù)資料
| 型號： | L9907N |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT |
| 中文描述： | 汽車大燈調(diào)整橋 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大小： | 83K |
| 代理商： | L9907N |
FUNCTIONAL DESCRIPTION
The L9907N is a power comparator with full-
bridge push-pull outputs, intended for driving a
DC motorin the headlingadjustmentsystem.
The basic function of the device is shown in the
input-outputtranfercharacteristic, Fig. 1.
For differential input voltage (V
INC
- V
INF
) lower
than the negative NEUTRAL ZONE threshold, V
N-
the output voltage is negative (corresponds to
motor direction right), for increasingdifferential in-
put voltage,this status changesto the zero output
voltage (motor is activelybraked), when the differ-
ential input voltage exceeds the V
ST-
stop range
threshold.The output statusremains in this condi-
tion as long as the differential input voltage re-
mains within the NEUTRAL ZONE. If the input
voltage increases above the positive NEUTRAL
ZONE threshold V
N+
, the output voltage become
positive (motor direction left).
Similar behaviour is obtained for decreasing the
input voltage. The output status transitions are
marked with the arrows showing the correspond-
ing direction of the output status variation. The
active braking mode is got with both outputs in
”HIGH” status
The above described behaviour assures high po-
sitioning precision, corresponding to the STOP
RANGE and high noise immunity in the adjusted
condition due to the NEUTRAL ZONE hysteresis
thresholds.
Both the above described thresholds are defined
referring to I
NC
, I
NF
pins. The error due to voltage
Figure 3:
RecommendedApplicationCircuit Diagram with L9907Nfor trackingregulation
(V
F
= V
C
for 1.5V < V
C
< V
S
-2V):
drop over the input signal source resistances
R
INC
, R
INF
is minimized with extremely low input
bias currentsI
INC
, I
INF
.
The above mentioned resistors (R
INC
, R
INF
) are
necessary for the input current limitation during
the transients on the V
BAT
line. The input source
resistors must be dimensioned so that in case of
a line transient the input current in the input pin,
clamped with the internal input protection diodes
do not increase over the specified absolute maxi-
mum value.
V
BAT
V
S
-2V
1.5V
V
F
0
1.5V
V
S
-2V
V
BAT
V
C
D95AT183A
Figure2:
Controltofeedbacktransfercharacteristic
for trackingregulation(V
F
= V
C
within
the nominal V
INC
operatingrange):
D1
D2
C
S
I
Q
R
C
V
INC
R
INF
R
INC
R
PR
R
CF
PR
L9907N
I
INC
INC
V
INF
I
INF
INF
V
S
R
F
V
C
V
F
GND
OUT C
OUT F
M
V
M
I
M
V
BAT
D95AT184
MODULE
Note:
Recommended value of R
, R
(equivalent input resistance to I
and I
) is 5K
to 10K
. Resistor R
should assure that the differential
inputvoltage|V
- V
| remains withinthe NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfiledthe
motor will not change its previous position.
L9907N
4/8
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參數(shù)描述 |
|---|---|
| L9907ND | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Motor Bridge RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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| L9911 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR |
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