L9907 [STMICROELECTRONICS]

MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT; MOTOR桥前大灯调整


型号：	L9907
厂家：	ST
描述：	MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT MOTOR桥前大灯调整光纤
文件：	总8页 (文件大小：86K)
中文：	中文翻译
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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

SO20L(12+4+4)

FAST STOP THROUGH SHORT-CIRCUITING

THE MOTOR

MOTOR STOP STATUS IN CASE OF OPEN

INPUT CONDITION

ORDERING NUMBER: L9907ND (SO20L)

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 automotiveelectronics en-

vironmental conditions.

BLOCK DIAGRAM

V_S

1.2V

R_PR

REFERENCE

BIAS

PROTECTION

FUNCTIONS

INC

I_INC

OUT C

V_INC

OUT F

I_M

INF

I_INF

V_INF

L9907N

1.2V

D95AT189

GND

1/8

December 1996

L9907N

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

V_SDC

V_SP

DC Supply Voltage

Supply Voltage Pulse (T ≤ 400ms)

DC Output Current

I_{OUT_DC}

I_{OUT_P}

I_IN

±0.4

0.8

Output Current Pulsed (100ms)

DC Input Current

±10

±40

150

°C

I_IN

Input Current Pulse (2ms)

T_s

Storage Shutdown Junction Temperature Range (*)

(*) Recommended maximal T_amb≤ 105°C

PIN CONNECTION

V_S

OUT_C

N.C.

GND

N.C.

IN_C

N.C.

OUT_F

N.C.

GND

N.C.

IN_F

N.C.

D95AT181

THERMAL DATA

Symbol

Parameter

SO20L

Unit

°C/W

R_{th j-amb}

R_{th j-pins}

Thermal Resistance Junction-ambient (1)

Thermal Resistance Junction-pins

(1) with 6cm²on board heat sink area

2/8

L9907N

ELECTRICAL CHARACTERISTICS

(7V < V_S< 18V, –40 C < T_j< 150 C; unless otherwise specified.)

Symbol

Parameter

Quiescent Current

Test Condition

Min.

Typ.

Max.

Unit

I_q

I_OUT= 0, (Output Open)

|V_din| < 20mV (stop)

|V_din| < 200mV (L or R)

-V_N-, V_N+

Neutral Zone Threshold (2)

1.5 < V_INC< V_S-2V; V_S= 12V

_PR= ∞

_PR= 0

3 x V_ST

120

240

4 x

VST

4 x V_ST

-V_ST-,V_ST+Stop Range Threshold

1.5 < VINC< V_S-2V;V_S= 12V

_PR= ∞

_PR= 0

100

V_INCL

Control Input LOW Disable

Threshold

T_j= -40 to +25ºC

T_j= >25ºC

0.8

0.6

1.2

1.5

V_INCH

V_{CH (3)}

Control Input HIGH Disable

Threshold (4)

Outputs = ON

with RINC = 0Ω

with R_INC= 5KΩ

V_S-2

V_S-1.5

V_S-1.4

with R_INC= 10K

Ω

Outputs = OFF

with R_INC= 0Ω

V_S-0.8

V_S-0.6

V_S-0.4

with R_INC= 5K

Ω

with R_INC= 10KΩ

I_IN

Input Bias Current

1.5 < V_INC< V_S-2V; V_S= 12V

_din= 0; R_PR

_din= ± 200mV; R_PR= ∞

_din= 0; R_PR= 0

0.45

0.9

0.8

1.5

2.0

4.0

3.6

6.8

µA

∞

V_din

I_OUT= 0.7A

_OUT= 0.35A

I_OUT= 0.7A

_OUT= 0.35A

200mV; R = 0

V_OSI

Output Saturation Voltage

Sink Stage

1.1

0.8

1.4

1.1

V_OSO

Output Saturation Voltage

Source Stage

1.2

0.9

1.5

(2) With a programming resistor R_PRbetween the PR pin and GND the N+ and N- thresholds can be adjusted from the nominal value (R_PR= ∞

, pin PR open) up to two times the nominal value (R_PR= 0, pin PR shorted to GND).

R_PR

1 +

9.5KΩ

R_PR

The formula defining V_N+,V_N-typical value as a function of R_PRand V_Sis:–V_N−= V_N+= (36mV + 0.017 V_S)

1 + 2

9.5KΩ

for R_PR= ∞ this formula reduced to:

-V_N+(R_PR= ∞) = V_N+(R_PR= ∞) = 18mV + 0.0086 V_S.

for V_sin V and R_PRin KΩ these formulas result in mV

(3) V_CHis the control input voltage applied to the pin I_NCthrough a serial resistor R_INC

(4) OUTPUTS = UNDEFINED for: V_S-2V < V_CH(R_INC= 0Ω) < V_S-0.8V

V_S-1.5V< V_CH(R_INC= 5KΩ) < V_S-0.6V

V_S-1.4V< V_CH(R_INC= 10KΩ) < V_S-0.4V

Figure 1: L9907N Differential Input to Output Transfer Characteristics

V_M=V_OUTC-V_OUTF

MOTOR

DIRECTION LEFT

V_N-

MOTOR

V_INC-V_INF

V_N+

DIRECTION RIGHT

V_H+

NEUTRALZONE

STOP RANGE

V_H-

D95AT182

3/8

L9907N

drop over the input signal source resistances

R_INC, R_INFis minimized with extremely low input

FUNCTIONAL DESCRIPTION

The L9907N is a power comparator with full-

bridge push-pull outputs, intended for driving a

DC motor in the headlingadjustmentsystem.

The basic function of the device is shown in the

input-outputtranfer 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).

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_BATline. 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.

Figure 2: Controlto feedbacktransfercharacteristic

for trackingregulation (V_F= V_Cwithin

the nominal V_INCoperatingrange):

D95AT183A

BAT

-2V

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_NFpins. The error due to voltage

1.5V

BAT

1.5V

V -2V

Figure 3:

Recommended Application Circuit Diagram with L9907N for trackingregulation

(V_F= V_Cfor 1.5V < V_C< V_S-2V):

MODULE

I_Q

V_BAT

V_S

C_S

R_PR

R_INC

V_INC

OUT C

I_INC

R_F

INC

V_M

R_C

L9907N

R_CF

OUT F

I_M

I_INF

R_INF

V_INF

V_C

V_F

INF

GND

D95AT184

Note:

Recommended value of R_INC, R_INF(equivalent input resistance to I_NCand I_NF) is 5KΩ to 10KΩ. Resistor R_CFshould assure that the differential

input voltage |V_INC- V_INF| remains withinthe NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfiled the

motor will not change its previous position.

4/8

L9907N

assure the safety of the circuits in the reverse bat-

tery condition a reverse protection diode D₁, is

necessary.

An external resistor R_CFis recommended be-

tween the slider of the control and feedback po-

tentiometer.

The input currents in this condition are limited by

the resistors R_INCand R_INF. The transient protec-

tion diode D₂must assure that the maximum rat-

ing for V_Sduring the transients at V_BATline will be

limited to a value lower than absolute maximum

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_Shigher than

18V, both outputs are forced to tristate in this con-

dition.

Figure 4:

Controlto feedbacktransfercharacteristic

for proportionalregulation withextended

V_Coperating range:

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.

D95AT185A

BAT

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 temperaturedecreases under the thermal

enable threshold. This behaviour is assured with

the thermal shutdown hysteresis threshold, which

minimum value is 20°C.

-2V

1.5V

BAT

1.5V

V -2V

Figure 3, 5 and 7 show typical application dia-

grams for headlight adjustment applications. To

Figure 5:

RecommendedApplicationCircuit Diagramwith L9907Nforproportionalregulationwith extended

R_INC2

V_Coperatingrange. For ideal adjusted condition V_F=

V_C:

R_INC1+ R_INC2

MODULE

I_Q

V_BAT

V_S

C_S

R_PR

OUT C

I_INC

R_INC1

R_F

INC

V_M

R_C

V_INC

L9907N

R_INC2

OUT F

I_M

I_INF

R_INF

V_INF

V_C

V_F

INF

GND

D95AT186

Note:

Recommended value of R_INC, R_INF(equivalent input resistanceto I_NCand I_NF) is5KΩ to10KΩ. If themotor should not change its position, when

≤

the control signal wire become open, R_INC1and R_INC2should be rated so that V_INC0.4V in this condition.

5/8

L9907N

rating for V_S. The device features an output dis-

able function in case of control input voltage over-

drive.

Figure 6: Controlto feedbacktransfercharacteristic

for proportionalregulation with reduced

V_Coperatingrange:

When the control input voltage increases above

D95AT187A

BAT

the HIGH control input disable threshold V_INC

_INCH, typically V_S-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.

-2V

The potential of the I 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 V_CRis specified for differentR_INC.

1.5V

BAT

1.5V

V -2V

ALLOWED VC OPERATINGRANGE

Figure 7:

RecommendedApplicationCircuit Diagram with L9907Nforproportionalregulationwith reduced

R_INF2

V_Coperatingrange. For ideal adjusted condition V_F=

V_C:

R_INF2R_INF2

MODULE

I_Q

V_BAT

V_S

C_S

R_PR

R_INC

V_INC

OUT C

I_INC

R_F

INC

V_M

R_C

L9907N

R_CF

OUT F

I_M

I_INF

R_INF1

V_INF

V_C

V_F

INF

GND

R_INF2

D95AT188

Note:

Recommended value of R_INC, R_INF(equivalent input resistance to I_NCand I_NF) is 5KΩ to 10KΩ. Resistor R_CFshould 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.

6/8

L9907N

SO20 PACKAGE MECHANICAL DATA

inch

TYP.

DIM.

MIN.

TYP.

MAX.

2.65

0.3

MIN.

MAX.

0.104

0.012

0.096

0.019

0.013

0.1

0.004

2.45

0.49

0.32

0.35

0.23

0.014

0.009

0.5

0.020

45° (typ.)

12.6

13.0

0.496

0.394

0.512

0.419

10.65

1.27

0.050

0.450

11.43

7.4

0.5

7.6

0.291

0.020

0.299

0.050

0.030

1.27

0.75

8° (max.)

7/8

L9907N

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 criticalcomponentsin life support devices or systems without express

written approval of SGS-THOMSON Microelectronics.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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8/8

L9907 [STMICROELECTRONICS]

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