TLE8104E Datasheet, PDF (13/27 Pages) Infineon Technologies AG – Smart Quad Channel Powertrain Switch

TLE8104E
Smart Quad Channel Powertrain Switch
Electrical and Functional Description of Blocks
5.3.4.1 Over Load Protection
The TLE8104E is protected in case of over load or short circuit of the load. The current is limited to I_DS(lim). After
time t_d(fault), the corresponding over load flag CLn is set. The channel may shut down due to over temperature.
The over load flag (CLn) of the affected channel is cleared by the rising edge of the CS signal after a successful
SPI transmission. For timing information, please refer to Figure 8 for details.
IN
FAULT
CS
I_D
I
D ( lim)
t
d(fault)
CL = 1_b
t
d(fault)
CL = 0_b
CL = 1_b
t
t
t
t
CL = 0_b
Figure 8 Over Load Behavior
5.3.4.2 Over Temperature Protection
A dedicated temperature sensor for each channel detects if the temperature of its channel exceeds the over
temperature shutdown threshold. If the channel temperature exceeds the over temperature shutdown threshold,
the overheated channel is switched off immediately to prevent destruction. At the same time (no delay), the over
temperature flag Tn is set. After cooling down, the channel is switched on again with thermal hysteresis ∆T_j.
The over temperature flag of the affected channel is cleared by the rising edge of the CS signal after a successful
SPI transmission.
5.3.5 Reverse Polarity Protection
In the case of reverse polarity when outputs are turned off, the intrinsic body diode of the power transistor causes
power dissipation. The reverse current through the intrinsic body diode has to be limited by the connected load.
The V_S supply pin must be protected against reverse polarity externally. Please note that neither the over load nor
over temperature are functional in reverse current operation.
Data Sheet
13
V1.4, 2010-04-26