1EDI2002AS_15 Datasheet, PDF (44/147 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

EiceDRIVER™ SIL
1EDI2002AS
Functional Description
Pulse Suppressor
In order to increase the device’s robustness against external disturbances, a pulse suppressor can be enabled by
setting bit SCFG.PSEN. Register SRTTOF shall also programmed with a value higher than 2_H. When a PWM turn-
on sequence occurs, the activation of the output stage is delayed by the programmed TTOFF number of cycles,
as for a normal TTOFF sequence. However, the PWM command received by the secondary chip signal is
internally sampled at every SSOSC cycle before the actual turn-on command is executed by the output stage. If
at least one of the sampling point does not detect a high level, the turn-on sequence is aborted and the device is
not switched on.
In case a valid PWM ON command is detected by the secondary side after the decision point the previous
sequence has been aborted, a new turn-on sequence is initiated.
One of the consequence of activating the pulse suppressor is that all PWM pulses shorter than the programmed
TTOFF plateau time are filtered out (Figure 2-15).
Note: The Pulse Suppressor only acts on turn-on pulses, not on turn-off pulses.
tPULSE < tTTOFF+ 2 . tSSOSC
SCFG.PSEN=1b
Input Pulse
Output Pulse
Figure 2-15 TTOFF: pulse suppressor aborting a turn-on sequence
Pulse filtered out
Datasheet
44
Hardware Description
Rev. 3.1, 2015-07-30