TLE7232G Datasheet, PDF (19/36 Pages) Infineon Technologies AG – SPI Driver for Enhanced Relay Control

SPI Driver for Enhanced Relay Control
SPIDER - TLE 7232G
Protection Functions
OLCR.OVL = 0
IN
I_D
I_D(lim)
t_d(fault)
Figure 8
L = 1_b
Over Load Behavior
OLCR.OVL = 1
IN
t
I_D
I_D(lim)
t
L = 0_b
t
t_d(off)
t
L = 1_b
L = 0_b
OverLoadTiming .emf
4.2.2 Over Temperature Protection
A temperature sensor for each channel causes an overheated channel n to switch off
immediately to prevent destruction. The behavior in case of over temperature can be
configured as follows:
a) After cooling down, the channel is switched on again with thermal hysteresis ∆T_j.
b) The affected channel stays switched off until the over temperature flag is cleared.
The over temperature flag of the affected channel is cleared by a low-high transition of
the input signal.
4.2.3 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 over-temperature protection as well as other protective functions are not active
during reverse polarity.
Data Sheet
19
V1.0, 2005-09-30