1EDI2001AS_15 Datasheet, PDF (56/135 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

EiceDRIVER™ SIL
1EDI2001AS
Protection and Diagnostics
The DESAT function is not active while the output stage is in PWM OFF state.
The blanking time needs to be chosen carefully, since the DESAT protection may be de facto inhibited if the PWM
ON-time is too short compared to the chosen blanking time.
At turn-off, the DESAT signal is pulled down for the duration of the TTOFF plateau time, and extended by the
blanking time once the hard turn off sequence is initiated.
VTON / VTOFF
VCC2
tTTOFF
VEE2
VDESAT
VCC2
tBLANK
tBLANK
time
0V
time
Figure 3-2 DESAT Operation
Note: . In case the DESAT pin is open, the pull-up resistance ensures that a DESAT event is generated at the next
PWM turn-on command.
DESAT Clamping during turn-off
The internal pull-up resistance may lead to the unwanted charging of the DC-link capacitance via the DESAT pin.
In order to overcome this, the DESAT function needs to be activated by clearing bit SCFG.DSTCEN. When this
bit is set, pin DESAT is internally clamped to GND2 when a PWM off command is issued by the device.
Datasheet
56
Hardware Description
Rev. 3.1, 2015-07-30