DRV8718-Q1: different supplies Chip and H-Bridge MOSFET possible?

KlausWawrzyniak

Part Number: DRV8718-Q1

Hello, my customer is asking whether it is possible to have two separate VCCs in the system, one for the DRV (e.g. 5-10V) and one for the MOSFETs (Vdd abt. 48V).

What else is to look for when doing "split supply"?

Thanks, Klaus

over 4 years ago

0 Don Dapkus over 4 years ago

TI__Guru**** 189401 points

Hi, Klaus,

Long time, no talk!!!

Our office is closed today for the US Labor Day holiday. We will be back at work tomorrow.

Best regards,

Don

0 Ryan Kehr over 4 years ago in reply to Don Dapkus

TI__Guru 55615 points

Klaus,

This is not recommended per the datasheet and the device would not be able to handle 48V anyway. Is 48V a hard requirement and automotive qual is required?

Regards,

Ryan

0 KlausWawrzyniak over 4 years ago in reply to Ryan Kehr

TI__Intellectual 1890 points

Hi Ryan,

well, please have a look at page 148, figure 9-1. In that figure I see that Vbatt and PVDD are not connected. So I assume that they can be of different value, like

So PVDD = 5 ... 10V and Vbatt = 48V.

Is this possible in general?

What are the max. value of difference between PVDD and Vbatt?

Also, it helps if you could point me to the exact location in the datasheet where this is described.

Thanks, Klaus

0 Ryan Kehr over 4 years ago in reply to KlausWawrzyniak

TI__Guru 55615 points

Klaus,

That is an unfortunate oversight in that figure. Please see the section below in datasheet.

Regards,

Ryan

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DRV8718-Q1: different supplies Chip and H-Bridge MOSFET possible?