TPS65131-Q1: TPS65131 - Load Distance and Stabilization

groger57

Part Number: TPS65131-Q1
Other Parts Discussed in Thread: TPS65131

Hello:

I am planning on using the TPS65131TRGERQ1 device in a design, and will of course follow the evaluation module's recommended design and other recommendations. The output will be +12V / -12V, driven with a 3.6V / 17Ah Lithium cell.

The load the supply will be connected to is about 18 inches from the enclosure that houses the supply. With this in mind, is there anything I need to design in to help insure stability of the supply? I expect the current to be about 125mA maximum on either side. I would do the typical things like use twisted pair wiring. Would additional capacitance be of any benefit, provided the ESR is appropriate for the design?

Thanks for any feedback on this you can provide.

Gary

over 5 years ago

0 Grant Falkenburg over 5 years ago

TI__Intellectual 1965 points

Hi Gary,

Let me contact the expert for this part. You can expect a response by 10/30/19.

Best,

Grant

0 groger57 over 5 years ago in reply to Grant Falkenburg

Intellectual 260 points

Thank you, will watch for your response.

0 Liaqat Khan over 5 years ago

TI__Mastermind 18550 points

Hello Gary,

I would suggest to install bulk capacitance on load side of the wiring so that any fast load current changes can be supplied by local bulk capacitance on load side. I also suggest to create a footprint for a 22uF capacitor on TPS65131 side of the wiring, in addition to the one that is already recommended in the typical application schematics, and leave it un-populated on the board. If you run into any stability issues during initial bring up of the board, you can experiment with installing this un-populated capacitor.

Kind Regards,

Liaqat

0 groger57 over 5 years ago in reply to Liaqat Khan

Intellectual 260 points

Good recommendation, and one I had already planned on. Just double checking because some buck/boost devices can be unstable if the load is too far removed, and also my first time using this device. Nice to know some extra storage should alleviate any issues.

Thanks Liaqat.

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TPS65131-Q1: TPS65131 - Load Distance and Stabilization