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L9911B Datasheet(PDF) 8 Page - STMicroelectronics

Part # L9911B
Description  CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR
PDF  15 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9911B Datasheet(HTML) 8 Page - STMicroelectronics

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Figure 7. Phase Regulation Characteristics
PRINCIPLE OF PHASE REGULATION:
When VB+ is above the regulated voltage, the field driver is controlled to keep phase peak voltage from
falling below VPHH1.
If phase peak voltage drops below VPHL1, phase regulation does not work.
Figure 8. Application Diagram
Engine
Ign. Switch
W/Lamp
Ifield
F+/DFM
off
on
off
on
off
on
t_SL
t_ST
Field Pre-
excitation
Field
Regulation
Load ON
+
_
L9911
L
B+
F+
P
GND
DFM
to E.C.U.
+Vb / Vcc
ignition
switch
warning lamp
Field
Stator
C



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