STGAP1STR datasheet(32/67 Pages) STMICROELECTRONICS

32 / 67 page

Functional description

STGAP1S

32/67

DocID027190 Rev 3

Figure 12. Example of VCE active clamping protection connection

When the VCECLAMP is activated during the turn-off phase a watchdog timer starts inside

the driver. This timer allows the VCECLAMP pin to act on the driver's output status for

a tVCECLoff time maximum. After that time has expired, the driver continues the normal turn-

off ignoring the VCECLAMP pin status. This assures that the protection is only acting to

clamp inductive VCE spikes during the turn-off.

The timer is reset and the VCECLAMP protection is enabled again at the beginning of the

following turn-off sequence.

Figure 13. VCECLAMP timing diagram

The VCECLAMP pin is masked and has no effect on the driver's outputs status when the

external MOSFET/IGBT is on.

The VCE active clamping protection can be disabled connecting the VCECLAMP pin to VL.

Floating

Section

Control

Logic

VCECLAMP

GON

GOFF

CLAMP

GNDISO

CLAMPth

Level

Shifter

tVCECLoff

GON\GOFF

VCECLAMP

VCEcounter

counting

ready

stopped

ready

stopped

STGAP1STR 数据表(PDF) 32 Page - STMicroelectronics

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