1ED020I12FA2

Single IGBT Driver IC

Functional Description

Data Sheet

10

Rev.3.0

2016-04-04

Figure 4

Application Example Unipolar Supply

4.3

Internal Protection Features

4.3.1

Undervoltage Lockout (UVLO)

To ensure correct switching of IGBTs the device is equipped with an undervoltage lockout for both chips, refer

to Figure 8.

monitored, otherwise negative supply voltage range from 0 V to -12 V would not be possible.

4.3.2

READY Status Output

The READY output shows the status of three internal protection features.

• UVLO of the input chip

• UVLO of the output chip after a short delay

• Internal signal transmission after a short delay

It is not necessary to reset the READY signal since its state only depends on the status of the former mentioned

protection signals.

4.3.3

Watchdog Timer

During normal operation the internal signal transmission is monitored by a watchdog timer. If the

transmission fails for a given time, the IGBT is switched off and the READY output reports an internal error.

GND1

IN+

IN-

RDY

/FLT

/RST

VCC1

OUT

VCC2

GND2

CLAMP

DESAT

+5V

VEE2

SGND

IN+

RDY

FLT

RST

+15V

NC

10R

1k

10R

220p

1µ

100n