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PDF L9907N Data sheet ( Hoja de datos )
| Número de pieza | L9907N | |
| Descripción | MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT | |
| Fabricantes | STMicroelectronics | |
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L9907N
MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT
FULL BRIDGE OUTPUT CONFIGURATION
WITH LOW SATURATION VOLTAGE LESS
THAN 3.2V AT OUTPUT CURRENT 0.7A
OPERATING SUPPLY VOLTAGE RANGE 7V
TO 18V. SUPPLY OVERVOLTAGEUP TO 50V
HIGH POSITIONING PRECISION AND HIGH
NOISE IMMUNITY DUE TO TRANSFER
CHARACTERISTICS WITH NEUTRAL ZONE
AND STOP RANGE THRESHOLD
FAST STOP THROUGH SHORT-CIRCUITING
THE MOTOR
MOTOR STOP STATUS IN CASE OF OPEN
INPUT CONDITION
SUPPLY OVERVOLTAGE PROTECTION
FUNCTION FOR Vs MORE THAN 18V, UP
TO 50V
INPUT PROTECTION AGAINST TRAN-
SIENTS ON THE BATTERY LINE AND THE
REVERSE BATTERY CONDITION
THERMAL OVERLOAD PROTECTION
ESD PROTECTED ACCORDING TO MIL883C
SO20L(12+4+4)
ORDERING NUMBER: L9907ND (SO20L)
DESCRIPTION
The L9907N is a monolithic integrated power
comparator with full bridge output configuration,
intended for driving DC motors in positioning sys-
tems, optimized for headlight adjustment applica-
tion and respecting the automotive electronics en-
vironmental conditions.
BLOCK DIAGRAM
PR
RPR
INC
VINC
=
IINC
INF
VINF
=
IINF
December 1996
= 1.2V
REFERENCE
BIAS
PROTECTION
FUNCTIONS
-
+
==
+
-
VS VS
=
OUT C
M
OUT F
IM
=
1.2V
L9907N
D95AT189
GND
1/8
1 page  
L9907N
An external resistor RCF 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
ZONE and the motor position remains frozen.
The circuit features an overvoltage disable func-
tion referred to the supply voltage VS higher than
18V, both outputs are forced to tristate in this con-
dition.
The thermal overload function disables the out-
puts (tristate) when the junction temperature in-
creases above the thermal shutdown threshold
temperature of min. 150°C.
For the start of a heavy loaded 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 temperature decreases under the thermal
enable threshold. This behaviour is assured with
the thermal shutdown hysteresis threshold , which
minimum value is 20°C.
Figure 3, 5 and 7 show typical application dia-
grams for headlight adjustment applications. To
assure the safety of the circuits in the reverse bat-
tery condition a reverse protection diode D1, is
necessary.
The input currents in this condition are limited by
the resistors RINC and RINF. The transient protec-
tion diode D2 must assure that the maximum rat-
ing for VS during the transients at VBAT line will be
limited to a value lower than absolute maximum
Figure 4: Control to feedbacktransfer characteristic
for proportionalregulation with extended
VC operating range:
VBAT
D95AT185A
VS -2V
VF
1.5V
0
1.5V
VC
VS -2V VBAT
Figure 5: RecommendedApplication Circuit Diagram with L9907Nfor proportionalregulation with extended
VC operating range. For ideal adjusted condition
VF
=
RINC2
RINC1 + RINC2
⋅
VC:
MODULE
VBAT
D1
D2
RC
VC
IQ
CS RPR
PR
RINC1
IINC
RINC2
VINC
INC
RINF IINF
VINF
INF
VS
L9907N
GND
OUT C
VM M
OUT F
IM
RF
VF
D95AT186
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5KΩ to 10KΩ. If the motor should not change its position, when
the control signal wire become open, RINC1 and RINC2 should be rated so that VINC ≤ 0.4V in this condition.
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L9907N.PDF ] | |
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