Electrical specification

L9915

18/21

DocID026400 Rev 1

3.3.8

Pin "L"

Alarm detection

The device turns ON the lamp after the validation time (TLalarm) if one of the conditions in

the below table is verified.

Table 13. Electrical characteristics - Pin “L”

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Lamp driver

saturation voltage

1

1.2

1.4

V

Lamp driver

saturation voltage in

self bias condition

1

-

4

V

-

2

4

8.2

kΩ

High voltage

threshold key-ON

detector

-

0.8

0.9

1

V

Low voltage

threshold key-on

detector

-

0.7

0.8

0.9

V

Over-current

limitation

-

1

1.5

2

A

Maximum time

duration of linear

current limitation

25

30

35

ms

Retry time in case of

over-current

510

600

690

ms

Turn on delay time

-

-

-

100

μs

Alarm validation

time

-

340

400

460

ms

Table 14. TLalarm validation time conditions

Detection condition

Related pin

No activity on PH pin

F driver or its connection degraded

F shortened to GND (Over-current on F driver)

F shortened to B

Battery sensor on B pin or F driver degraded

Low B Voltage (Battery under-voltage)