TPS2663: 4 TPS26633 parallel use application

Jonathan Geronga

Part Number: TPS2663

Hi Team,

Our customer will be using 4 TPS26633 IC in parallel (all powered from a common rail and outputting on a common rail). He'll be adding the external FETs to make use of the RCB and RPP feature. The question is would every TPS26633 part require the external FETs or just one of them because all the TPS26633 parts are in parallel?

Please let me know your input.

By the way, I already shared this thread to the customer:
https://e2e.ti.com/support/power-management/f/196/p/899239/3325203

The customer answer was:
it shows discrete components C(d/dt), R(ilim), R(ilon) for each tps26630 even though pins dV/dT, ILIM and IMON are connected between the two TPS26630 parts. he would think you'd only need one set of the discrete parts, otherwise, having two in parallel would change the value seen by these pins.

Thanks,

Jonathan

over 3 years ago

0 Rakesh over 3 years ago

TI__Guru** 102701 points

Hi Jonathan,

External MOSFET on single TPS2663 part would be enough for reverse current blocking. Please refer connections in the attached circuit.

Common Cdvdt, Rimon and UVLO, OVP components works however we suggest to keep separate Rilim so that current regulation loops operates independently and don't make unstable system.

Best regards, Rakesh

0 Rakesh over 3 years ago in reply to Rakesh

TI__Guru** 102701 points

0 Jonathan Geronga over 3 years ago in reply to Rakesh

TI__Expert 7930 points

Hi Rakesh,

Thank you very much for your support and for the informative answer.

Upon sharing this with our customer, here' an additional question that I hope you can give comment:

If he changes his mind in the future and revert back to having one blocking FET for each TPS2663, would that still work?
You recommended having common Cdvdt, Rimon, UVLO, OVP but would independent Cdvdt, Plim also work?

Regards,

Jonathan

0 Rakesh over 3 years ago in reply to Jonathan Geronga

TI__Guru** 102701 points

Hi Jonathan,

If he changes his mind in the future and revert back to having one blocking FET for each TPS2663, would that still work?

-> Yes

You recommended having common Cdvdt, Rimon, UVLO, OVP but would independent Cdvdt, Plim also work?

-> I would still recommend to tie Cdvdt pins together to have synchronized operation during startup and recovery from fault (auto-retry mode)

Best regards, Rakesh

0 Jonathan Geronga over 3 years ago in reply to Rakesh

TI__Expert 7930 points

Hi Rakesh,

Thanks for the immediate answer.

Upon sharing this with our customer, he comes up with another question below:
- About the Plim pin? does it matter if its tied or independent across the parallel TPS26633?

Regards,

Jonathan

0 Rakesh over 3 years ago in reply to Jonathan Geronga

TI__Guru** 102701 points

Hi Jonathan,

Plim should be independent (like Rilim) and use separate Plim resistor for each TPS26633 device.

Best regards, Rakesh

0 Jonathan Geronga over 3 years ago in reply to Rakesh

TI__Expert 7930 points

Hi Rakesh,

Thank you for this answer.

I think this will be the last confirmation of the customer:
Can you confirm his summary for parallel operation of TPS26633?:

External Blocking FET - Independent or Common
Cdvdt - Common
Plim - Independent
Rilim - Independent
Rimon - Independent or Common
Uvlo - Independent or Common
OVP - Independent or Common
PGTH - Independent or Common
PGOOD - Independent or Common

Regards,

Jonathan

LAUNCHXL-CC2640R2

0 Rakesh over 3 years ago in reply to Jonathan Geronga

TI__Guru** 102701 points

Correct Jonathan.

Power management

Power management forum

TPS2663: 4 TPS26633 parallel use application

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