TLD2326EL_15 Datasheet, PDF (20/30 Pages) Infineon Technologies AG – 3 Channel High Side Current Source

TLD2326EL
Load Diagnosis
8
Load Diagnosis
8.1
Open Load
An open load diagnosis feature is integrated in the TLD2326EL driver IC. If there is an open load on one of the
outputs, the respective output is turned off. The potential on the IN_SET pin rises up to V_{IN_SET(OL/SC)}. This high
voltage can be used as input signal for an µC as shown in Figure 9. The open load status is not latched, as soon
as the open load condition is no longer present, the output stage will be turned on again. An open load condition
is detected, if the voltage drop over the output stage V_PS is below the threshold according Pos. 8.4.6 and a filter
time of t_OL is passed.
V _{I N_ SET}
V_{IN _SET( OL /SC)}
VIN_ SET( ref )
t_OL
t_{IN _SET (re set)}
t
V_OUT
VS
V_S – V_{PS(OL )}
VF
open load
occurs
open load
disappears
t
Figure 13 IN_SET behavior during open load condition
8.2
Short Circuit to GND detection
The TLD2326EL has an integrated SC to GND detection. If the output stage is turned on and the voltage at the
output falls below V_OUT(SC) the potential on the IN_SET pin is increased up to V_{IN_SET(OL/SC)} after t_SC. This condition
is not latched. For detecting a normal condition after a short circuit detection an output current according to I_OUT(SC)
is driven by the channel.
Data Sheet
20
Rev. 1.1, 2015-03-24