12ASX2 datasheet(40/147 Pages) INFINEON

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EiceDRIVER

™ SIL

1EDI2002AS

Functional Description

Datasheet

Rev. 3.1, 2015-07-30

Hardware Description

2.4.6

Driver Functionality

The structure of the output stage and its associated external booster of the device is depicted Figure 2-12:

Figure 2-12 Output Stage Diagram of Principle

2.4.6.1

Overview

Two turn-off behaviors are supported by the device, depending on the event causing the turn-off action.

•

Regular Turn-Off.

•

Safe Turn-Off.

A Safe Turn-Off sequence uses the timing and plateau level parameters defined in register SSTTOF. It is triggered

by a DESAT or an OCP event only. A turn-off sequence which is not “Safe” is then “Regular”. A Regular Turn-Off

sequence uses the timing parameters defined in register SRTTOF and the plateau level defined by

SCTRL.GPOFS.

Two Level Turn-Off (TTOFF)

Because a hard turn-off may generate a critical overvoltage on the IGBT leading eventually to its destruction, the

1EDI2002AS supports the Two Level Turn-Off functionality (TTOFF). The TTOFF function consists in switching

the IGBT off in three steps in such a way that:

1. The IGBT gate voltage is first decreased with a reduced slew rate until a specific (and programmable) voltage

is reached by the TOFF signal.

2. TOFF (and TON) voltage is stabilized at this level. The IGBT Gate voltage forms thus a plateau.

3. Finally, the switch-off sequence is resumed using hard commutation.

The TTOFF delays and plateau voltage are fully programmable using the corresponding SPI commands. For a

Regular Turn-Off sequence, the TTOFF delay is defined by bit field SRTTOF.RTVAL. Setting this field to 00

completely disables the TTOFF function for all Regular Turn-Off sequences (but this has no effect on Safe Turn-

Off sequences). The plateau level is defined by SCTRL.GPOFS. If this function is to be activated, a minimum value

for the delay time has to be programmed.

VCC2

TOFF

Gate Driver

DACLP

TON

GATE

Ron

Roff

VGND2

VEE2

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