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

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.

December 1996

1.2V

INC

L9907N

INC

INF

GND

OUT C

OUT F

D95AT189

REFERENCE

BIAS

PROTECTION

FUNCTIONS

1.2V

BLOCK DIAGRAM

ORDERING NUMBER: L9907ND (SO20L)

SO20L(12+4+4)

1/8

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

SDC

DC Supply Voltage

Supply Voltage Pulse (T

400ms)

OUT_DC

DC Output Current

0.4

OUT_P

Output Current Pulsed (100ms)

0.8

DC Input Current

Input Current Pulse (2ms)

Storage Shutdown Junction Temperature Range (*)

150

(*) Recommended maximal T

amb

105

THERMAL DATA

Symbol

Parameter

SO20L

Unit

th j-amb

Thermal Resistance Junction-ambient (1)

C/W

th j-pins

Thermal Resistance Junction-pins

C/W

(1) with 6cm

on board heat sink area

OUT

N.C.

GND

N.C.

GND

N.C.

OUT

N.C.

D95AT181

PIN CONNECTION

L9907N

2/8

ELECTRICAL CHARACTERISTICS (7V < V

< 18V, 40

C < T

< 150

C; unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Quiescent Current

OUT

= 0, (Output Open)

din

| < 20mV (stop)

din

| < 200mV (L or R)

7
6

9
7

mA
mA

-V

-, V

N+

Neutral Zone Threshold

(2)

1.5 < V

INC

< V

-2V; V

= 12V

= 0

3 x V

120
240

4 x

VST

4 x V

mV
mV

-V

ST-

ST+

Stop Range Threshold

1.5 < VINC < V

-2V; V

= 12V

= 0

25
50

38
76

100

mV
mV

INCL

Control Input LOW Disable
Threshold

= -40 to +25ºC

= >25ºC

0.8
0.6

1.2
1.2

1.5
1.5

V
V

INCH

CH (3)

Control Input HIGH Disable
Threshold (4)

Outputs = ON
with RINC = 0

with R

INC

= 5K

with R

INC

= 10K

-2

-1.5

-1.4

V
V
V

Outputs = OFF
with R

INC

= 0

with R

INC

= 5K

with R

INC

= 10K

-0.8

-0.6

-0.4

V
V
V

Input Bias Current

1.5 < V

INC

< V

-2V; V

= 12V

din

= 0; R

din

200mV; R

din

= 0; R

= 0

din

200mV; R

= 0

0.45

0.9
0.8
1.5

2.0
4.0
3.6
6.8

OSI

Output Saturation Voltage
Sink Stage

OUT

= 0.7A

OUT

= 0.35A

1.1
0.8

1.4
1.1

V
V

OSO

Output Saturation Voltage
Source Stage

OUT

= 0.7A

OUT

= 0.35A

1.2
0.9

1.5

V
V

(2) With a programming resistor R

between the PR pin and GND the N+ and N- thresholds can be adjusted from the nominal value (R

, pin PR open) up to two times the nominal value (R

= 0, pin PR shorted to GND).

The formula defining V

N+,

N-

typical value as a function of R

and V

is: V

= (

36mV

0.017

)

9.5K

for R

this formula reduced to:

-V

N+

) = V

N+

) = 18mV + 0.0086

for V

in V and R

in K

these formulas result in mV

(3) V

is the control input voltage applied to the pin I

through a serial resistor R

INC

(4) OUTPUTS = UNDEFINED for: V

-2V < V

INC

= 0

) < V

-0.8V

-1.5V < V

INC

= 5K

) < V

-0.6V

-1.4V < V

INC

= 10K

) < V

-0.4V

N-

MOTOR

DIRECTION RIGHT

D95AT182

H-

H+

N+

MOTOR

DIRECTION LEFT

INC

-V

INF

NEUTRALZONE

STOP RANGE

OUTC

-V

OUTF

Figure 1: L9907N Differential Input to Output Transfer Characteristics

L9907N

3/8

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 (V

INC

- V

INF

) lower

than the negative NEUTRAL ZONE threshold, V

N-

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 V

ST-

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 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

, I

pins. The error due to voltage

drop over the input signal source resistances
R

INC

, R

INF

is minimized with extremely low input

bias currents I

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.

BAT

-2V

1.5V

-2V

BAT

D95AT183A

Figure 2: Control to feedbacktransfer characteristic

for tracking regulation (V

= V

within

the nominal V

INC

operating range):

INC

INF

INC

L9907N

INC

INF

GND

OUT C

OUT F

BAT

D95AT184

MODULE

Figure 3: Recommended Application Circuit Diagram with L9907N for tracking regulation

= V

for 1.5V < V

< V

-2V):

Note:
Recommended value of R

INC

, R

INF

(equivalent input resistance to I

and I

) is 5K

to 10K

. Resistor R

should assure that the differential

input voltage |V

INC

- V

INF

| 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 R

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 V

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

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

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 D

, is

necessary.
The input currents in this condition are limited by
the resistors R

INC

and R

INF

. The transient protec-

tion diode D

must assure that the maximum rat-

ing for V

during the transients at V

BAT

line will be

limited to a value lower than absolute maximum

BAT

-2V

1.5V

-2V

BAT

D95AT185A

Figure 4: Control to feedbacktransfer characteristic

for proportionalregulation with extended
V

operating range:

INC

INF

INC1

INC2

L9907N

INC

INF

GND

OUT C

OUT F

BAT

D95AT186

MODULE

Figure 5: RecommendedApplication Circuit Diagram with L9907N for proportional regulation with extended

operating range. For ideal adjusted condition V

INC2

INC1

INC2

Note:
Recommended value of R

INC

, R

INF

(equivalent input resistance to I

and I

) is 5K

to 10K

. If the motor should not change its position, 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

rating for V

. 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 V

INC

INCH

, typically V

-1.2V or decreases below the

LOW control input disable threshold V

INC

> V

INCH

typically 1.2V, then both outputs will be forced to
tristate.
The potential of the I

pin is clamped at the Con-

trol Input HIGH disable threshold potential with a
series resistor of 5K

typ. To activate the HIGH

disable comparator an input current of 35

A typ.

is needed. To respect this behaviour in the appli-
cation V

is specified for different R

INC.

BAT

-2V

1.5V

-2V

BAT

D95AT187A

ALLOWED VC OPERATING RANGE

Figure 6: Control to feedback transfer characteristic

for proportional regulation with reduced
V

operating range:

INC

INF1

INC

L9907N

INC

INF

GND

OUT C

OUT F

BAT

D95AT188

MODULE

INF2

Figure 7: Recommended Application Circuit Diagram with L9907N for proportional regulation with reduced

operating range. For ideal adjusted condition V

INF2

Note:
Recommended value of R

INC

, R

INF

(equivalent input resistance to I

and I

) is 5K

to 10K

. Resistor R

should assure that the differential

input voltage |V

INC

- V

INF

| 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

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.

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L9907N

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