BTS5235G Datasheet, PDF (21/30 Pages) Infineon Technologies AG – Smart High-Side Power Switch PROFET Two Channels, 60 mΩ

Smart High-Side Power Switch
BTS 5235G
Diagnosis
Details about timings between the diagnosis signal I_IS and the output voltage V_OUT and
load current I_L in ON-state can be found in Figure 15.
IN _OFF
V_OUT
ON
t_ON
normal operation over load (current limitation)
t
t
I_L
t_{sIS( ON)}
I_IS
t_{sIS( L C)}
Figure 15 Timing of Diagnosis Signal in ON-state
t_sIS(OVL)
t
V_IS(fault) / R_S
t
SwitchOn .emf
In case of over-load as well as over-temperature, the voltage V_IS(fault) is fed to the
diagnosis pins as long as the according input pin is high. This means, even if the
overload disappears after the first thermal shutdown or when the device keeps switching
on and off in over-load condition (thermal toggling), the diagnosis signal(V_IS(fault)) is
constantly available. Please refer to Figure 16 for details. Please note, that if the
overload disapears before the first thermal shutdown, the diagnosis signal (V_IS(fault)) may
remain for approximately 300 µs longer than the duration of the overload.
As a result open load and over load including over temperature can be differentiated in
ON-state.
Consideration must be taken in the selection of the sense resistor in order to distinguish
nominal currents from the overload/short circuit fault state. A potential of 5 V at the sense
pin can be achieved with a big sense resistor even with currents being much smaller than
the current limitation.
Data Sheet
21
V1.0, 2005-12-19