TLE7233EM Datasheet, PDF (19/33 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control

SPI Driver for Enhanced Relay Control
SPIDER - TLE7233EM
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 data sheet. Fault conditions are considered as
“outside” normal operating range. Protection functions are not designed for continuous repetitive operation.
7.1
Over Load Protection
The TLE7233EM 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 as described in chapter 8. Please refer to Figure 8 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 8 Shut Down at Over Load on channel 0
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 and a
junction temperature decrease of ΔT_J. Please refer to Chapter 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 VDD and VDDA supply pins must be externally protected against reverse polarity. The over temperature
and over load protection are not active during reverse polarity.
Data Sheet
19
Rev. 1.2, 2014-05-09