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L9912 Datasheet(PDF) 37 Page - STMicroelectronics

Part # L9912
Description  Automotive vehicle conform car alternator regulator IC
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9912 Datasheet(HTML) 37 Page - STMicroelectronics

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DocID029639 Rev 2
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L9912
Electrical specifications
83
5.3.14
Pin "GHS" and "GLS"
Figure 16. External high current lamp pre-driver circuitry
A high current external MOS driver is available in case the lamp/relay system requires more
current than the internal MOS can deliver. The GHS and GLS pins are dedicated to drive the
external MOSs' gates providing the necessary current.
The gate-source-voltage of the external Power-MOS is limited by the driver circuit.
21
tLfilterLS
Low-side current
limitation filter
time
Analogue filter time
-
40
-
μs
22
VLrevHS
High-side
reverted bias
protection over-
drive
High-side turn-on
I(L)>ILpulldw to cause high-side turn-off
[i.e. V(L)-V(A+/B+)>0 V]
-550
-
mV
1. In Power Stand-by mode the pull-up current is -5µA,min.
2. In case of L pin used for RVC protocol (RVC drive mode) I(L)= 20mA,max.
3. The microcontroller application software must take care to respect the value in item #17
Table 23. Electrical characteristics pin "L" (continued)
#
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit



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