1EDI2002AS_15 Datasheet, PDF(60/147 Page) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

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1EDI2002AS_15 Datasheet, PDF (60/147 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

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3.2

Protection Functions: Category A

EiceDRIVERâ¢ SIL

1EDI2002AS

Protection and Diagnostics

3.2.1

Desaturation Protection

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

Table 3-2 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 and detection threshold).

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 3-1).The DESAT

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

SSTAT2.DSATC.

EiceDRIVER â¢ SIL

Vcc2

Logic

Class A

Generation

DSAT _Sup_active

Comp

DSAT

Fixed Vref

Threshold Selection

Voltage

Divider

Clamping_active

DESAT

GND2

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 âanalogâ 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).

Datasheet

Hardware Description

Rev. 3.1, 2015-07-30

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