1EDI2004AS View Datasheet(PDF) - Infineon Technologies
Part Name
Description
MFG CO.
'1EDI2004AS' PDF : 138 Pages View PDF
EiceDRIVERTM SIL
1EDI2004AS
Protection and Diagnostics
3.2
Protection Functions: Category A
3.2.1
Desaturation Protection
The integrated desaturation (DESAT) functionality is summarized in Table 19:
Table 19 DESAT Protection Overview
Parameter
Short Description
Function
Periodicity
Monitoring of the VCE voltage of the IGBT.
Continuous while device issues a PWM ON command.
Action in case of failure event 1. Emergency (Safe) Turn-off Sequence.
2. Error Flag SER.DESATER is set.
3. Assertion of signal NFLTA.
Programmability
Yes (blanking time).
In-System Testability
Yes (see also Chapter 3.5.3 and Chapter 3.5.4).
The DESAT function aims at protecting the IGBT in case of short circuit. The voltage drop VCE over the IGBT is
monitored via the DESAT pin while the device issues a PWM ON command. The voltage at pin DESAT is
externally filtered by an external RC filter, and decoupled by an external diode (see Figure 17).The DESAT
voltage is compared to an internal reference voltage. The result of this comparison is available by reading bit
SSTAT2.DSATC.
EiceDRIVER ™ SIL
5V
Vcc2
DSAT _Sup_active
Logic
Class A
Generation
Comp
DSAT
Fixed Vref
Voltage
Divider
DESAT
Clamping_active
GND2
Figure 17 DESAT Function: Diagram of Principle
At the beginning of a turn-on sequence, the voltage at pin DESAT is forced to Low level for the duration the
blanking time defined by register SDESAT0 (or SDESAT1, see below). Once the blanking time has elapsed, the
voltage at pin DESAT is released and is compared to an internal reference voltage. Depending on the value of
the decoupling capacitance, an additional “analog” blanking time will be added corresponding to the
charging of the capacitance through the internal pull-up resistance (Figure 18).
Data Sheet
56
Rev. 2.0
2019-01-16
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