L9911(2005) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L9911
(Rev.:2005)

CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR

STMicroelectronics 

Figure 13. Soft Start/attack Characteristics

on

Engine off

on

Ign. Switch off

on

W/Lamp off

t_ST

t_SL

Ifield

F+/DFM

Field Pre-

excitation

Field

Regulation

Load ON

L9911

Table 10. Fault Detection

Root Cause

Signal

Effect

Test detect

Alternator belt breaking

P

Alternator disexcitation VP<VPHH1 & VB+<Vreg

Brushes open

P

Alternator disexcitation VP<VPHH1 & VB+<Vreg

Field Driver Open

P

Alternator disexcitation VP<VPHH1 & VB+<Vreg

Field interruption

P

Alternator disexcitation VP<VPHH1 & VB+<Vreg

Field short circuit to the battery

F+

Overvoltage

VF+>VS1 & VB+ > Vov-d

Field short circuit to the ground

P

Alternator disexcitation VP<VPHH1 & VB+<Vreg

Battery discharge

B+

Undervoltage

VB+<Vuv

The diagnostic result is disabled during the Soft-start delay time t_ST 0...3 and the soft-start / soft attack timing t_SL 0...3

Figure 14. DFMonitor Electrical configuration

L9911

B+

Alternator

Field

F+

Control

Circuit

Field driver

Regulator assy

Valim

R

DFM

to the ECU

DFMon driver

Test circuit

11/15

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