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| TLE75008-EMD_15 Datasheet, PDF (40/64 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control | |||
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8
Protection Functions
TLE75008-EMD
Protection Functions
8.1
Over Load Protection
The TLE75008-EMD is protected in case of over load or short circuit of the load. There are two over load current
thresholds (see Figure 17):
⢠IL(OVL0) between channel switch ON and tOVLIN
⢠IL(OVL1) after tOVLIN
Every time the channel is switched OFF for a time longer than 2 * tSYNC the over load current threshold is set back
to IL(OVL0).
INn
OUT.OUTn
t
IL(OVL)
IL(OVL0)
IL(OVL 1)
t
tOVLIN
OverLoadStep.emf
Figure 17 Over Load current thresholds
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 according diagnosis bit ERRn is set. The channel can be switched ON after clearing the protection
latch by setting the corresponding HWCR_OCL.OUTn bit to â1â. This bit is set back to â0â internally after de-latching
the channel. Please refer to Figure 18 for details.
INn
OUT.OUTn
ILn
IL(OVLn)
tOFF(OVL)
ERRn
0
SPI command to set
HWCR_OCL.OUTn = 1b
HWCR_OCL.OUTn
1
0
Figure 18 Latch OFF at Over Load
t
t
0
t
t
1
0
t
OverLoad.emf
8.2
Over Temperature Protection
A temperature sensor is integrated for each channel, causing an overheated channel to switch OFF to prevent
destruction. The according diagnosis bit ERRn is set (combined with Over Load protection). The channel can be
Data Sheet
40
Rev. 1.1, 2015-09-25
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