L9907 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L9907

MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT

STMicroelectronics 

L9907N

Figure 6: Control to feedback transfer characteristic

for proportional regulation with reduced

VC operating range:

VBAT

D95AT187A

VS -2V

VF

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.

1.5V

0

1.5V

VS -2V VBAT

ALLOWED VC OPERATING RANGE

VC

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:

MODULE

VBAT

D1

IQ

D2

CS RPR

VS

PR

OUT C

RC

VC

RINC

IINC

RF

RCF

VINC

INC L9907N VM M

OUT F

RINF1

IINF

INF

IM

VF

VINF

GND

RINF2

D95AT188

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.

6/8

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