Pull-up Resistor on FAULT Pin

The FAULT pin is an open collector output and therefore

requires a pull-up resistor to provide a high-level signal.

Also the FAULT output can be wire ‘OR’ed together with

other types of protection (e.g. over-temperature, over-

voltage, over-current ) to alert the microcontroller.

used as secondary gate discharge path. * indicates component required for negative gate drive topology

Other Possible Application Circuit (Output Stage)

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16

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9

DESAT

FAULT

CATHODE

ANODE

ANODE

CATHODE

+_

+_

Q1

Q2

+

-

3-PHASE

AC

+

-

0.1µF 0.1µF

0.1µF

*

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2

3

4

5

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8

16

15

14

13

12

11

10

9

DESAT

FAULT

CATHODE

ANODE

ANODE

CATHODE

+_

+_

Q1

Q2

+

-

3-PHASE

AC

+

-

0.1µF 0.1µF

0.1µF

9

*

Capacitor on FAULT Pin for High CMR

Rapid common mode transients can affect the fault pin

voltage while the fault output is in the high state. A 330

pF capacitor should be connected between the fault pin

and ground to achieve adequate CMOS noise margins at

the specified CMR value of 15 kV/µs. The added capaci-

tance does not increase the fault output delay when a

desaturation condition is detected.