1EDI2004AS View Datasheet(PDF) - Infineon Technologies
Part Name
Description
MFG CO.
'1EDI2004AS' PDF : 138 Pages View PDF
EiceDRIVERTM SIL
1EDI2004AS
Protection and Diagnostics
In case the measured voltage is higher than the internal threshold, an Emergency (Safe) Turn-Off sequence is
initiated, bit SER.DESATER is set and a fault notification is issued on pin NFLTA (in case of an OPM transition
the state machine - see Chapter 2.4.7).
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 (only if less than 0x40 is configured) once the hard turn off sequence is initiated.
VTON / VTOFF
VCC2
tTTOFF
VEE2
VDESAT
VCC2
tBLANK
tBLANK
time
GND2
time
Figure 18 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 setting 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.
Data Sheet
57
Rev. 2.0
2019-01-16
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