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L9800 データシート(PDF) 34 Page - STMicroelectronics

部品番号 L9800
部品情報  Automotive 8-channel LS driver
PDF  55 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9800 データシート(HTML) 34 Page - STMicroelectronics

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8
Protection functions
8.1
Overload protection
The L9800 has two different overload current thresholds that preserve itself in case of overload or short-circuit of
the load (see Figure 24):
•
IL(OVL0) between channel switch on and tOVLIN
•
IL(OVL1) after tOVLIN
Every time the channel is switched off the over load current threshold is set back to IL(OVL0).
Figure 24. Overload thresholds
GADG071120230941GT
OUTn driving
signal
IL(OVL)
IL(OVL0)
IL(OVL1)
tOVLIN
In case the load current is higher than IL(OVL0) or IL(OVL1), after time tOFF(OVL) the over loaded channel is switched
off and the corresponding diagnosis bit DIAG_OVC_OVT.OUTn is set to “1”. The channel can be switched on
after clearing the protection latch by setting the corresponding DIAG_OVC_OVT_RLW.OUTn bit to “1”. This bit is
set back to “0” internally after de-latching the channel. Please refer to Figure 25 for details.
Figure 25. Latch-off overload
GADG071120230946GT
OUTn driving
signal
IL
IL(OVL1)
0
1
0
1
0
0
DIAG_OVC_OVT.OUTn
DIAG_OVC_OVT_RLW.OUTn
tOFF(OVL)
L9800
Protection functions
DS14041 - Rev 2
page 34/55



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