12ASX2 datasheet(60/147 Pages) INFINEON

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EiceDRIVER

™ SIL

1EDI2002AS

Protection and Diagnostics

Datasheet

Rev. 3.1, 2015-07-30

Hardware Description

3.2

Protection Functions: Category A

3.2.1

Desaturation Protection

The integrated desaturation (DESAT) functionality is summarized in Table 3-2:

The DESAT function aims at protecting the IGBT in case of short circuit. The voltage drop V

CE 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 3-1).The DESAT

voltage is compared to an internal reference voltage. The result of this comparison is available by reading bit

SSTAT2.DSATC.

Figure 3-1 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 SDESAT. 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 3-2).

In case the measured voltage is higher than the selected 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).

Table 3-2

DESAT Protection Overview

Parameter

Short Description

Function

Monitoring of the V

CE voltage of the IGBT.

Periodicity

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 and detection threshold).

In-System Testability

Yes (see also Chapter 3.5.3 and Chapter 3.5.4).

Comp

DSAT

Fixed Vref

Voltage

Divider

DSAT _Sup_active

Class A

Generation

Logic

Vcc2

DESAT

Clamping_active

GND2

EiceDRIVER ™ SIL

Threshold Selection

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