DRV8301/2 dead time setting in 3-input mode.

Hi Shane,

check this at page 12 of the data sheet DRV8312

" External dead time will override internal dead time as long as the time is longer than the dead time setting (minimum hand shake time cannot be reduced in order to prevent shoot through current). "

So 50ns is the smallst deadtime, if you just ground the DTC pin. Otherwise DTC resistor is the boss!

Regards,

Long

Okay, thanks. I interpreted that as saying that external dead time set by the microcontroller (on INH and INL pins) would be observed as long as it was longer than the DTC resistor setting. So, if there was a 1us gap between INH high-to-low transistion and INL low-to-high transition, it would override the DTC setting. However, if there was no gap between INH high-to-low transition and the INL low-to-high transition, the DTC resistor setting would determine the deadtime.

What I was wondering is if the DTC resistor dead time setting is also applied when using 3-input mode and driving only INH pins. I would assume that this is the case, but the note on page 20 of the DRV8301 datasheet under the PWM_MODE setting says:

"PWM with three independent inputs. PWM control high side gates only. Low side is complementary to high side gates with minimum internal dead time."

That could be interpreted as the minimum as set by the DTC resistor or the minimum overall (50ns). I was looking for clarification of that scenario.

Thanks again!

Thank you, question answered!