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L9800 データシート(PDF) 35 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) 35 Page - STMicroelectronics

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8.2
Overtemperature protection
A temperature sensor is integrated for each channel. Eight temperature sensors are present, causing any
overheated channel to switch off to prevent destruction. The thermal protection is disabled (masked) when the
channel is in the off state. The thermal protection is enabled when the channel is in on state only. The diagnosis
bit DIAG_OVC_OVT is set accordingly (combined with overload protection). 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.
8.3
Overtemperature and overload in limp-home mode
In limp-home mode, through the input pin IN0 and IN1, the channels 2 and 3 can be switched on. In case of
overload, short-circuit or overtemperature the channels are switched off. If IN0 and IN1 remain “high”, the channel
remains on, in case of overload the channels restart at every tRETRY.
Figure 26. Restarter in limp-home mode
8.4
Electrical parameters
3 V < VBATT < 18 V, 3 V < VDDIO < 5.5 V, T J = -40 °C to 150 °C, unless otherwise noticed.
Table 15. Overtemperature and overload electrical parameters
Symbol
Description
Test condition
Min.
Typ.
Max.
Unit
Overload
IL(OVL0_LS)
High overload detection current
TJ = -40 °C
1
1.9
A
IL(OVL0_LS)
High overload detection current
TJ = 25 °C
1
1.7
A
IL(OVL0_LS)
High overload detection current
TJ = 150 °C
1
1.7
A
IL(OVL1_LS)
Low overload detection current
TJ = -40 °C
0.6
1
A
IL(OVL1_LS)
Low overload detection current
TJ = 25 °C
0.6
1
A
IL(OVL1_LS)
Low overload detection current
TJ = 150 °C
0.6
1
A
tOVLIN
Overload threshold switch delay time
Covered by SCAN
110
170
260
µs
tOFF(OVL)
Overload shut down deglitch filter
BIM.OUTn=0B,
Covered by SCAN
4
5.5
6.5
µs
OVT
TJ(SC)
Thermal shut-down temperature
182
192
202
°C
Timings
tRETRY
Restart time in limp-home mode
Covered by SCAN
29
41
52
ms
tOVT
Overtemperature switch off time
Design info
50
µs
Note:
All the digital filtering times reported in the Table 15 are to be considered without spread spectrum.
L9800
Protection functions
DS14041 - Rev 2
page 35/55



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