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參數(shù)資料
| 型號： | L9907ND |
| 廠商： | 意法半導體 |
| 英文描述： | MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT |
| 中文描述： | 汽車大燈調整橋 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 83K |
| 代理商： | L9907ND |
An external resistor R
CF
is recommended be-
tween the slider of the control and feedback po-
tentiometer.
This resistor assures that in the case of input con-
trol or input feedback wire interruption the input
differential voltage will be within the NEUTRAL
ZONEand the motor position remains frozen.
The circuit features an overvoltage disable func-
tion referred to the supply voltage V
S
higher than
18V, both outputs are forced to tristatein thiscon-
dition.
The thermal overload function disables the out-
puts (tristate) when the junction temperature in-
creases above the thermal shutdown threshold
temperatureof min. 150
°
C.
For the start of a heavyloaded motor, if the motor
current reaches the max. value it is necessary to
respect the dynamical thermal resistance junction
to ambient.The maximum output current is 0.8A.
The maximum junction temperature in this phase
should not increase above the thermal shutdown
threshold. In case of output disable due to ther-
mal overload the output remains disabled till the
junction temperaturedecreasesunder the thermal
enable threshold. This behaviour is assured with
the thermalshutdownhysteresis threshold, which
minimum value is 20
°
C.
Figure 3, 5 and 7 show typical application dia-
grams for headlight adjustment applications. To
assurethe safety of the circuits in the reversebat-
tery condition a reverse protection diode D
1
, is
necessary.
The input currents in this condition are limited by
the resistors R
INC
and R
INF
. The transient protec-
tion diode D
2
must assure that the maximum rat-
ing for V
S
during the transientsat V
BAT
line will be
limited to a value lower than absolute maximum
Figure4:
Controltofeedbacktransfercharacteristic
forproportionalregulation withextended
V
C
operating range:
V
BAT
V
S
-2V
1.5V
V
F
0
1.5V
V
S
-2V
V
BAT
V
C
D95AT185A
D1
D2
C
S
I
Q
R
C
V
INC
R
INF
R
INC1
R
PR
R
INC2
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
D95AT186
MODULE
Figure 5:
RecommendedApplicationCircuitDiagramwithL9907Nforproportionalregulationwith extended
V
C
operatingrange. For ideal adjustedcondition V
F
=
R
INC2
R
INC1
+
R
INC2
V
C
:
Note:
Recommendedvalue of R
INC
, R
INF
(equivalentinput resistanceto I
NC
and I
NF
) is5K
to10K
. If themotor shouldnot changeitsposition, when
the control signal wire become open, R
INC1
and R
INC2
should be rated so that V
INC
≤
0.4V in this condition.
L9907N
5/8
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