TPS62560: Is the dead time the same for both ON and OFF?

?? ??

Prodigy 30 points

Part Number: TPS62560

I understood that the dead time when ON is a few ns.

Is it the same time when OFF?
(Are the setting times for ON and OFF different?)

Is the design value 2ns(typ)?

Does the fall time of the waveform and the recovery time of the diode correspond to the dead time?

4 months ago

0 Josef Marsmann 4 months ago

TI__Intellectual 2750 points

Hello,

The dead time for HS-FET off and LS-FET on could be different to the dead time LS-FET off to HS-FET on.

The target for the design is that the dead time should be sort as possible but always >0 over all conditions.

The fall/rise time of the wave form isn't part of the dead time, please see plot below.

Best regards,

Sepp

0 ?? ?? 4 months ago in reply to Josef Marsmann

Prodigy 30 points

Hello,

I understood that the dead time is different on and off.
What are the factors that determine the dead time? (Which control is used to determine this?)
We would like to make sure that we do not turn ON simultaneously in any case.

Best regards,

0 Josef Marsmann 4 months ago in reply to ?? ??

TI__Intellectual 2750 points

Hello,

The internal control mechanism ensures under all conditions that the two FETs are never switched on at the same time. You can't influence this from outside.

Best regards,

Sepp

0 ?? ?? 4 months ago in reply to Josef Marsmann

Prodigy 30 points

Hello,

Thanks for the answer.

What is the internal mechanism?
Why not turn on at the same time?
(For example, the Vgs of the High FET is monitored internally, so they do not turn on at the same time, etc.)

Best regards,

0 Josef Marsmann 4 months ago in reply to ?? ??

TI__Intellectual 2750 points

Hello,

Before the the High FET is switching on, there is a check that the Low FET is turned off and the other way around to avoid that both are on.

Best regards,

Sepp

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TPS62560: Is the dead time the same for both ON and OFF?