L9907ND datasheet(6/8 Pages) STMICROELECTRONICS

Part #	L9907ND

Description	MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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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 5K

Ω typ. To activate the HIGH

disable comparator an input current of 35

µA typ.

is needed. To respect this behaviour in the appli-

cation VCR is specified for different RINC.

VBAT

VS -2V

1.5V

VF

0

1.5V

VS -2V

VBAT

VC

D95AT187A

ALLOWED VC OPERATING RANGE

Figure 6: Control to feedback transfer characteristic

for proportional regulation with reduced

VC operating range:

D1

D2

CS

IQ

RC

VINC

RINF1

RINC

RPR

RCF

PR

L9907N

IINC

INC

VINF

IINF

INF

VS

RF

VC

VF

GND

OUT C

OUT F

M

VM

IM

VBAT

D95AT188

MODULE

RINF2

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

VC operating range. For ideal adjusted condition VF

=

RINF2

+ RINF2

⋅ VC:

Note:

Recommended value of RINC,RINF (equivalent input resistance to INC and INF)is 5K

Ω 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

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