ISO5452: How to disable the DESAT fault detection

Danilo A.

Part Number: ISO5452

Hi Team,

A customer wants to know how to safely disable the DESAT fault detection because he encountered unwanted tripping of the device.

Regards,

Danilo

over 4 years ago

0 Audrey Dearien7 over 4 years ago

TI__Expert 4875 points

Hi Danilo,

Sometimes false tripping can be due to the noisy environment or too small of a blanking capacitor. The customer may make improvements to these in order to prevent false tripping. Can you add some more background or details to the issue they are having?

If you are asking how to reset the driver after a DESAT is detected, this is done by sending a low signal to the nRST/EN pin for longer than 800ns. This is shown in Figure 46 of the datasheet.

Regards,

Audrey

0 Danilo A. over 4 years ago in reply to Audrey Dearien7

TI__Mastermind 26370 points

Hi Audrey,

The customer is using the ISO5452 driver for a three level converter. He wish to disable the DESAT fault detection on the middle transistors because it trips on noise from the top most (or bottom most) transistors.

Regards,

Danilo

0 Audrey Dearien7 over 4 years ago in reply to Danilo A.

TI__Expert 4875 points

Hi Danilo,

I see. In that case, the DESAT pin can be shorted directly to GND2.

Regards,

Audrey

0 Danilo A. over 4 years ago in reply to Audrey Dearien7

TI__Mastermind 26370 points

Hi Audrey,

Thank you for your quick response and for the resolution to the customer's inquiry.

Regards,

Danilo

0 Audrey Dearien7 over 4 years ago in reply to Danilo A.

TI__Expert 4875 points

Hi Danilo,

You're welcome. Thanks for your post, and feel free to post again for any of your technical questions.

Please hit the green button to close out this thread.

Thank you,

Audrey

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ISO5452: How to disable the DESAT fault detection