L9907ND Fast Delivery |IC PHOENIX CO.,LIMITED

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L9907ND
MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT
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 OVERVOLTAGE UP 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
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
ABSOLUTE MAXIMUM RATINGS
(*) Recommended maximal Tamb ≤ 105°C
THERMAL DATA
(1) with 6cm2 on board heat sink area
PIN CONNECTION
L9907N
2/8
ELECTRICAL CHARACTERISTICS (7V < VS < 18V, –40°C < Tj < 150°C; unless otherwise specified.)
(2) With a programming resistor RPR between the PR pin and GND the N+ and N- thresholds can be adjusted from the nominal value (RPR = ∞
, pin PR open) up to two times the nominal value (RPR = 0, pin PR shorted to GND).
The formula defining VN+, VN- typical value as a function of RPR and VS is: –VN− = VN+ = (36mV + 0.017⋅ VS) ⋅
1 + RPR
9.5KΩ
1 + 2 ⋅ RPR
9.5KΩ
for RPR = ∞ this formula reduced to:
-VN+ (RPR = ∞) = VN+ (RPR = ∞) = 18mV + 0.0086 ⋅ VS.
for Vs in V and RPR in KΩ these formulas result in mV
(3) VCH is the control input voltage applied to the pin INC through a serial resistor RINC
(4) OUTPUTS = UNDEFINED for: VS -2V < VCH (RINC = 0Ω) < VS -0.8V
VS -1.5V < VCH (RINC = 5KΩ) < VS -0.6V
VS -1.4V < VCH (RINC = 10KΩ) < VS -0.4V
Figure 1: L9907N Differential Input to Output Transfer Characteristics
L9907N
FUNCTIONAL DESCRIPTION
The L9907N is a power comparator with full-
bridge push-pull outputs, intended for driving a
DC motor in the headling adjustment system.
The basic function of the device is shown in the
input-output tranfer characteristic, Fig. 1.
For differential input voltage (VINC - VINF) lower
than the negative NEUTRAL ZONE threshold, VN-
the output voltage is negative (corresponds to
motor direction right), for increasing differential in-
put voltage, this status changes to the zero output
voltage (motor is actively braked), when the differ-
ential input voltage exceeds the VST- stop range
threshold. The output status remains 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 VN+, 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 INC, INF pins. The error due to voltage
drop over the input signal source resistances
RINC, RINF is minimized with extremely low input
bias currents IINC, IINF.
The above mentioned resistors (RINC, RINF) are
necessary for the input current limitation during
the transients on the VBAT 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.
VBAT
VS -2V
1.5V
1.5V VS -2V VBAT
D95AT183A
Figure 2: Control to feedback transfer characteristic
for tracking regulation (VF = VC within
the nominal VINC operating range):
Figure 3: Recommended Application Circuit Diagram with L9907N for tracking regulation
(VF = VC for 1.5V < VC < VS -2V):
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5KΩ to 10KΩ. Resistor RCF should assure that the differential
input voltage |VINC - VINF| remains within the NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfiled the
motor will not change its previous position.
L9907N
4/8
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
VBAT
VS -2V
1.5V
1.5V VS -2V VBAT
D95AT185A
Figure 4: Control to feedback transfer characteristic
for proportional regulation with extended
VC operating range:
Figure 5: Recommended Application Circuit Diagram with L9907N for proportional regulation with extended
VC operating range. For ideal adjusted condition VF = RINC2
RINC1 + RINC2 ⋅ VC:
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.
L9907N
rating for VS. The device features an output dis-
able function in case of control input voltage over-
drive.
When the control input voltage increases above
the HIGH control input disable threshold VINC
VINCH, typically VS -1.2V or decreases below the
LOW control input disable threshold VINC > VINCH,
typically 1.2V, then both outputs will be forced to
tristate.
The potential of the INC pin is clamped at the Con-
trol Input HIGH disable threshold potential with a
series resistor of 5KΩ typ. To activate the HIGH
disable comparator an input current of 35μA typ.
is needed. To respect this behaviour in the appli-
cation VCR is specified for different RINC.
VBAT
VS -2V
1.5V
D95AT187A
ALLOWED VC OPERATING RANGE
Figure 6: Control to feedback transfer characteristic
for proportional regulation with reduced
VC operating range:
Figure 7: Recommended Application Circuit Diagram with L9907N for proportional regulation with reduced
VC operating range. For ideal adjusted condition VF = RINF2
RINF2 + RINF2 ⋅ VC:
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5KΩ to 10KΩ. Resistor RCF should assure that the differential
input voltage |VINC - VINF| remains within the NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfilled the
motor will not change its previous position.
L9907N
6/8

Partno	Mfg	Dc	Qty	Available	Descript
L9907ND	ST	N/a	30	avai	MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT