TPS65131: Request for Schematic Review

Andrew Baek

Intellectual 915 points

Part Number: TPS65131

Tool/software:

The purpose of this design is to supply clean +12V and -12V for op-amp operations.

The circuit initially steps up 5V to ±14V, then uses LDOs to regulate the output to ±12V.

For +12V, the TLV1117I is used, and for -12V, the TPS7A3001 is used.

Please let me know of any questions.

Regards,

Andrew

11 months ago

0 Andrew Baek 11 months ago

Intellectual 915 points

Here is the schematic for review

Thank you,

Andrew

fibersense_v2p17_pg23.pdf

0 Jared Zhou 11 months ago in reply to Andrew Baek

TI__Mastermind 20515 points

Hi Andrew,

Our expert is OoO and he will reply to you once he is back to office, thanks for your patience.

BR, Jared

0 Patrick Yao 11 months ago in reply to Andrew Baek

TI__Mastermind 34810 points

Hi Andrew,

Current FB resistors will set VPOS as ~15.2V and VNEG as ~-15.1V, not +/-14V.

Patrick

0 Andrew Baek 11 months ago in reply to Patrick Yao

Intellectual 915 points

Hi Patrick,

I have updated the schematic per your input.

Could you take another look at the schematic?

Regards,

Andrew

fibersense_v2p18_pg23.pdf

0 Patrick Yao 11 months ago in reply to Andrew Baek

TI__Mastermind 34810 points

Hi Andrew,

The recommended CN capacitor is 4.7nF, you can use 10nF as the first step, and adjust it based on future real board test.

Patrick

0 Andrew Baek 11 months ago in reply to Patrick Yao

Intellectual 915 points

Hi Patrick,

What is the CN in the schematic?

Regards,

Andrew

0 Patrick Yao 11 months ago in reply to Andrew Baek

TI__Mastermind 34810 points

Hi Andrew,

I mean the C537, the cap connected to IC CN pin.

Patrick

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TPS65131: Request for Schematic Review