參數(shù)資料
型號(hào)： L9524C-TR
廠商： STMICROELECTRONICS
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： LEAD FREE, SOP-24
文件頁(yè)數(shù)： 5/27頁(yè)
文件大小： 410K
代理商： L9524C-TR
L9524C
Functional description
13/27
Figure 3.
Shunt sense versus transistor sense
4.2
Supply
The main supply pin of the L9524C is the VS pin. The voltage applied to it (VVS) is
monitored
●
to switch off all glow plugs if it is less than VVS uv for at least tVS fil (“under voltage
failure”),
●
to switch off all glow plugs if it is greater than VVS ov for at least tVS fil (“over voltage
failure”),
●
to switch on all glow plugs if it is greater than VVS ld for at least tVS ld (“active clamping
during load dump”),
●
to ignore open-load failures if it is less than VVS ol.
Note:
The glow plugs are switched on again if the corresponding switch-on condition disappears,
except if the glow plugs are switched on because of load dump. Then they remain switched
on until VVS is less than VVS ov for at least tVS fil.
In modes 2 to 6, the L9524C is additionally supplied by the BAT pin. This auxiliary supply
ensures that the external power MOSFET’s are switched off if no main supply voltage is
available at the VS pin.
The BAT pin is additionally used to sense the battery voltage VBAT for power regulation in
modes 4 and 6 (see section “Power regulation”) and for detecting “battery under voltage
failure” (fuse between battery and module is defect) if VBAT is less than VBAT uv for at least
tBAT fil in modes 2 to 6.
An additional supply voltage higher than the main supply voltage is generated by an internal
charge pump which charges an external storage capacitor connected to the CP pin. This
capacitor mainly supplies the gates of the external n-channel power MOSFET’s. The charge
pump voltage VCP is monitored and the glow plugs are switched off if it is less than VCP uv
for at least tCP fil (“charge pump under voltage”). Afterwards, the glow plugs remain switched
off even if the charge pump voltage becomes greater than VCP uv until they are explicitly
switched on again by the CI (control input) pin.
glow plug
shunt
V
BAT
Gx
SPx
SNx
L9524C
glow plug
V
BAT
Gx
SPx
SNx
L9524C
shunt sense
transistor sense
015
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