L9409 datasheet(10/13 Pages) STMICROELECTRONICS

tên linh kiện	L9409

Giải thích chi tiết về linh kiện	Alternator voltage regulator with load response control

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Device description

L9409

10/13

Doc ID 022665 Rev 2

4.4

Protection and diagnosis

The table above lists the conditions that cause the fault lamp driver to function. To prevent

lamp flicker, specific faults are required to be present for TDELAY seconds before the lamp

driver is activated. This delay is indicated in Figure 11.

4.4.1

Diagnostic electric parameters

Table 11.

Diagnostic electric parameters

Table 10.

Fault lamp driver to function

Conditions

Delay

Phase voltage < VPL. The alternator is not generating, the belt is broken or

alternator is not rotating

Yes

VB-Vs > 2 V OR Vs>VOH. Over voltage warning

Yes

VS < VSO AND Phase frequency > fLRC_EN. S terminal is open during

generation

Yes

VB< VBO AND Phase frequency > fLRC_EN. B terminal is open during

generation

Yes

Phase frequency < fLRC_EN

Yes

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VPL

Low voltage warning threshold

VOH

Over voltage protection

threshold

15.1

16.5

17.5

VSO

S-terminal open threshold

VBS

Open threshold

1.6

2.0

2.2

fLRC_EN

Low speed threshold

130

145

160

TDELAY

Fault indication delay time

0.8

1.2

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