TLE7232GS Datasheet, PDF (18/32 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control

SPI Driver for Enhanced Relay Control
SPIDER - TLE7232GS
Block Description and Electrical Characteristics
5.2.1 Overload Protection
The SPIDER - TLE7232GS is protected in case of overload or short circuit of the load. The behavior in case of
overload can be configured as follows:
1. The current is limited to I_DS(LIM). After time t_d(fault), the according overload flag CLn is set. The channel may shut
down due to overtemperature.
2. The current is limited to I_DS(LIM). After time t_d(off), the overloaded channel n switches off and the according
overload flag CLn is set.
The overload flag (CLn) of the affected channel is cleared by a low-high transition of the input signal. For timing
information, please refer to Figure 8 for details.
OLCR.OVL = 0
OLCR.OVL = 1
IN
I_D
I_D(lim)
t_d(fault)
L = 1_b
Figure 8 Overload Behavior
IN
t
I_D
I_D(lim)
t
L = 0_b
t
t_d(off)
t
L = 1_b
L = 0_b
OverLoadTiming .emf
5.2.2 Overtemperature Protection
A temperature sensor for each channel causes an overheated channel n to switch off immediately to prevent
destruction. The behavior in case of overtemperature can be configured as follows:
1. After cooling down, the channel is switched on again with thermal hysteresis ∆T_j.
2. The affected channel stays switched off until the overtemperature flag is cleared.
The overtemperature flag of the affected channel is cleared by a low-high transition of the input signal.
5.2.3 Reverse Polarity Protection
In case of reverse polarity, 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_DD supply pin must be
protected against reverse polarity externally. The overtemperature protection as well as other protective functions
are not active during reverse polarity.
Data Sheet
18
Rev. 1.0, 2007-12-18