TLE7231G Datasheet, PDF (16/30 Pages) Infineon Technologies AG – SPIDER - 4 channel low side driver

SPI Driver for Enhanced Relay Control
SPIDER - TLE7231G
Protection Functions
7
Protection Functions
Note: The device provides embedded protective functions. Integrated protection functions are designed to prevent
IC destruction under fault conditions described in this datasheet. Fault conditions are considered as
“outside” normal operating range. Protection functions are not designed for continuous repetitive operation.
7.1
Over Load Protection
The TLE7231G is protected against over load or short circuit of the load. After time t_OFF(OVL), the over loaded
channel n switches off and therefore the corresponding diagnostics flag Dn is set. The channel can be switched
on after clearing the diagnostics flag. Please refer to Figure 7 for details.
IN
t_OFF(OVL)
t
I_D0
I_D0(OVL)
IN0 = 01 _b
D0 = 0 _b
D0 = 1_b
IN0 = 00 _b
D0 = 0 _b
IN0 = 01 _b
Figure 7 Shut Down at Over Load
t
OverLoad .emf
7.2
Over Temperature Protection
A temperature sensor for each channel causes an overheated channel n to switch off to prevent destruction. Then
the according diagnostics flag Dn is set. The channel can be switched on after clearing the diagnosis flag. Please
refer to Section 8 for information on diagnostics features.
7.3
Reverse Polarity Protection
In case of reverse polarity, the intrinsic body diode of the power transistor causes increased power dissipation. The reverse
current through the intrinsic body diode of the power transistor has to be limited by the connected load. The V_DD and V_DDA
supply pins must be externally protected against reverse polarity. The over temperature and over load protection are not active
during reverse polarity.
Datasheet
16
Rev. 1.0, 2008-02-28