DRV8714-Q1: PVDD level

Cherry Zhou

Part Number: DRV8714-Q1

Hi team,

Here's an issue from the customer may need your help:

What is "flying cap pick PVDD level" referring to? If the input is 7V, can 7V be selected for the corresponding PVDD level? Thanks.

Best Regards,

Cherry

over 2 years ago

0 Ryan Kehr over 2 years ago

TI__Guru 55605 points

Cherry,

Can you point me to the specific part of the datasheet where there is confusion? I am not able to find the quote in the datasheet. Section in datasheet or screen capture would help a lot here.

Regards,

Ryan

0 Cherry Zhou over 2 years ago in reply to Ryan Kehr

TI__Mastermind 22235 points

Hi Ryan,

Thanks for your support.

Is the PVDD rated ceramic capacitor referring to the PVDD voltage tolerant? For example, PVDD is 16 V, and the capacitor withstand level is at least 16 V. Or is this PVDD level referring to the maximum voltage of 40 V?

Thanks and regards,

Cherry

0 Ryan Kehr over 2 years ago in reply to Cherry Zhou

TI__Guru 55605 points

Cherry,

Understood now, thank you! The flying capacitor should be rated to the PVDD voltage used. If PVDD is 16V, use a 16V capacitor.

Regards,

Ryan

0 Cherry Zhou over 2 years ago in reply to Ryan Kehr

TI__Mastermind 22235 points

Hello Ryan,

Ryan Kehr said:
The flying capacitor should be rated to the PVDD voltage used. If PVDD is 16V, use a 16V capacitor.

Do you mean that regarding the capacitor voltage tolerance, just being greater than pvdd is ok? Is the same for very low pvdd voltages (e.g. 4.9)?

Thanks and regards,

Cherry

0 Ryan Kehr over 2 years ago in reply to Cherry Zhou

TI__Guru 55605 points

Cherry,

Correct, larger than PVDD is preferred. Same for low PVDD, but capacitor should be sized to handle the absolute maximum voltage expected on PVDD. The minimum does not matter.

Regards,

Ryan

Motor drivers

Motor drivers forum

DRV8714-Q1: PVDD level