TPS61163A: Inductor value

Cameron Wutzke

Part Number: TPS61163A

Tool/software:

Howdy experts!

datasheet recommends using a 4.7-10uH inductor, but it mentions that a 22uH inductor can also be used for high current applications and warns about potential stability issues.

7.2.2.1

the best option for my application is a 18uH inductor. Since this part could potentially support up to 22uH I think 18 should be ok, but since 18 is outside the recommended range I want to be careful with my testing. Can you recommend how best to test for any potential stability issues?

over 1 year ago

0 Patrick Yao over 1 year ago

TI__Mastermind 34780 points

Hi Cameron,

Due to the Boost converter RHPZ, large inductance will have potential stability risk. The worst case will be the Boost converter operating under the maximum load. So I would suggest customer validate their design with heavy load.

Patrick

0 Cameron Wutzke over 1 year ago in reply to Patrick Yao

TI__Expert 3592 points

Any advice how they can validate? I’m thinking a venable FRA or looking at load step ringing.

any guidance to test stability?

+1 Patrick Yao over 1 year ago in reply to Cameron Wutzke

TI__Mastermind 34780 points

Hi Cameron,

Because this part integrates the feedback net, so it is hard to run loop test directly.

The load transient could be a reference of the loop stability. And monitor SW to see whether there will be obviously duty cycle change is also available.

Patrick

0 Cameron Wutzke over 1 year ago in reply to Patrick Yao

TI__Expert 3592 points

Patrick, do you or the team have any stability or design calculators for this device?

(Sorry if I’m missing it somewhere)

thanks! This is looking like the best device for this design

0 Patrick Yao over 1 year ago in reply to Cameron Wutzke

TI__Mastermind 34780 points

Hi Cameron,

Unfortunately we don't have such calculation tool for this device. But I can help to run some bench tests with EVM to provide reference for customer.

Patrickk

0 Cameron Wutzke over 1 year ago in reply to Patrick Yao

TI__Expert 3592 points

That's ok, no need! EVM is on the way to customer so they can test with their inductors, I will review the switch node ringing for stability, then I will ask for your thoughts on the waveforms as well. Thank you!

0 Steven Li over 1 year ago in reply to Cameron Wutzke

TI__Mastermind 23190 points

Hi Cameron,

Our expert is currently out of office. He will reply to you next Monday. Thanks for your understanding.

Best Regards,

Steven

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TPS61163A: Inductor value