12ASX2 datasheet(45/147 Pages) INFINEON

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EiceDRIVER

™ SIL

1EDI2002AS

Functional Description

Datasheet

Rev. 3.1, 2015-07-30

Hardware Description

2.4.6.2

Switching Sequence Description

Figure 2-16 shows an idealized switching sequence. When a valid turn-on command is detected, a certain

propagation time t

PDON is needed by the logic to transfer the PWM command to the secondary side. At this point

the TTOFF delay time t

TTOFF defined by bit field SRTTOF.RTVAL is added before the turn-on command is

executed. Signal TON is then activated, while signal TOFF is deactivated.

In case the two level turn-on function is active, signal TON is increased up to the plateau voltage defined by bit

field SCTRL.GPONS. The duration t

TTON between the beginning of the turn-on sequence and the moment where

the switching sequence is resumed is defined by bit field SCFG2.TTOND.

When a valid turn-off command is detected, a certain propagation time t

DOFF is needed by the command to be

processed by the logic on the secondary side. This propagation time depends on the event having generated the

turn-off action (non exhaustive list):

•

In case of a PWM turn-off command at pin INP, t

DOFF=tPDOFF.

•

In case of a DESAT Event, t

DOFF=tOFFDESAT2.

•

In case of an OCP event, t

DOFF=tOFFOCP2.

•

In case of an Event Class A on the primary side: t

DOFF=tOFFCLA.

•

In case of an Event Class B on the secondary side: t

DOFF=tOFFCLB2.

When the turn-off command is processed by the logic, signal DACLP is deactivated (i.e. active clamping is

enabled). Signal TON and TOFF are decreased with the slew rate t

SLEW fixed by hardware. Once the voltage at

pin TOFF has reached the value defined by bit field SCTRL.GPOFS (or SSTTOF.GPS in the case of a safe turn-

off), the turn-off sequence is interrupted. Time t

TTOFF is defined as the moment when the device starts turning off

signal TOFF, and the moment where the turn-off sequence is resumed. Depending on the event that triggered the

turn-off sequence, t

TTOFF is given by either bit field SRTTOF.RTVAL or SSTTOF.STVAL. Once the TTOFF time

has elapsed, a hard commutation takes place, and signals TON and TOFF are driven to V

EE2.

Note: Once a turn-off sequence is started, it is completed to the end with the same delay parameters.

At the moment when the hard commutation takes place, signal DACLP remains deactivated for time t

ACL defined

by bit field SACLT.AT. When this time is elapsed, signal DACLP is reactivated (i.e. active clamping is disabled).

When bit SCFG2.ACLPM is set, signal DACLP is only deactivated in case of a safe turn-off sequence, for a total

duration t

ACL (+ tTTOFF, if applicable).

In case SACLT.AT is set to 0

H, DACLP is constantly activated (constant High level). In case SACLT.AT is set to

H, DACLP is constantly at Low level.

The Gate Monitoring function (time-out mechanism) is started at each turn-on and turn-off sequence. See

Chapter 3.4.2 for more details.

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