UCC21222: Minimum dead-time / minimum resistance on DT pin

Hello Vladislav,

I work as an Applications Engineer on the High Power Drivers group and can help answer your question.

For a minimum dead time, you would need to consider the sum of your pulse width distortion and channel-to-channel delay matching, with maximum values 5.5ns and 5ns, respectively of as specified in Section 6.10 in the datasheet:

You would also need to consider the differences of rise and fall time for a channel, and this depends on the load being driven. Once you have those values, you would add these to the 10-30 ns to provide the necessary margin (assuming worst case) for avoiding shoot through.

If this answered your question, could you please press the green button? If not, feel free to follow up with more questions.

Best regards,

Liban Hussein

Check out our training series on high power drivers here! These videos are great for anyone and cover everything from the basics up to design considerations for various power systems.

Get a kick start on your design by going to the Design & Development tab in any product page!

Hi Vladislav,

In my previous answer, I was not very explicit in the resistor value for a minimum dead time. To clarify this, we typically recommend 1k-ohm as the minimum dead time resistance, with no risk of damage for lower values.

If this answered your question, could you please press the green button? If not, feel free to follow up with more questions.

Best regards,

Liban Hussein

Check out our training series on high power drivers here! These videos are great for anyone and cover everything from the basics up to design considerations for various power systems.

Get a kick start on your design by going to the Design & Development tab in any product page!

Thank you for your answer. This resolved my issue. :-)