BQ25750: Is there a lower limit for the intermediate resistance RAC2 in the section “8.3.3.1 VAC Operating Window Programming (ACUV and ACOV)” ?

tamgoh

Part Number: BQ25750

Tool/software:

Hi,

In the section “8.3.3.1 VAC Operating Window Programming (ACUV and ACOV)” in DATASHEET (SLUSDY3 - DECEMBER 2023), is there a lower limit for the intermediate resistance RAC2?
I would like to know along with the reason.

The background of my question is that when I modified the BQ25750EVM to RAC2 = 10ohms, the DC-DC converter seems to have lost its operating range.

Best Regards,
Tamura Go

over 1 year ago

0 Ethan Galloway over 1 year ago

TI__Mastermind 31305 points

Hello Tamgoh,

You can use the design calculator to calculate what the ACUV/ACOV resistors should be: https://www.ti.com/tool/download/BQ25756-DESIGN-CALC/

According to the calculator, setting RAC2 = 10Ω changes the operating range to 44V to 48V.

Best Regards,
Ethan Galloway

0 tamgoh over 1 year ago in reply to Ethan Galloway

Prodigy 75 points

Hi Ethan,

Thank you for your answer.
Is it possible to continue the question and answer session in relation to this QUESTION in an undisclosed manner?

Best Regards,
Tamura Go

+1 Ethan Galloway over 1 year ago in reply to tamgoh

TI__Mastermind 31305 points

Hello Tamgoh,

Yes, we can. Can you send me a friend request and we can continue the conversation over the E2E messages? Does that work for you?

Best Regards,
Ethan Galloway

0 tamgoh over 1 year ago in reply to Ethan Galloway

Prodigy 75 points

Hi Ethan,

Thank you for your guidance.
The original question was about the behavior of narrowing the Operating Window width from the EVM default circuit constants, which I was able to resolve myself by reading DATASHEET and reviewing the requirements definition, so I am closing this ticket for now.

Best Regards,
Tamura Go

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BQ25750: Is there a lower limit for the intermediate resistance RAC2 in the section “8.3.3.1 VAC Operating Window Programming (ACUV and ACOV)” ?