UCC21520: If PIN6 is floating

Chris Wang

Prodigy 80 points

Part Number: UCC21520

Tool/software:

If PIN6 (DT) is floating, will any unexpected situation occur? For example, the dead time is random.

Thanks.

2 days ago

0 Will Appelt 2 days ago

TI__Intellectual 1605 points

Hi Chris,

In the part datasheet, it is mentioned that we do not recommend leaving the DT pin floating. So yes, there will be unexpected behaviors that result from doing so. If the dead time functionality is not wanted, you can connect the DT pin to VCCI to disable the feature.

Best regards,

Will

0 Chris Wang 2 days ago in reply to Will Appelt

Prodigy 80 points

Hi Will,

Can you provide the more detail functional block of DT control? This way I might be able to analyze potential errors.

Thanks.

0 Will Appelt 1 day ago in reply to Chris Wang

TI__Intellectual 1605 points

Hi Chris,

I cannot provide more detail on the internals of the DT control circuitry. If the DT pin is left floating, the device will assert a dead time value that is likely going to be unpredictable and varies with temperature.

Again, we do not recommend leaving the DT pin floating, and doing so can result in abnormal behaviors. If the DT functionality is not needed, we recommend to connect the pin to VCC.

Best regards,

Will

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UCC21520: If PIN6 is floating