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TPS2640: Design validation for power section.

Aakash Dey

Intellectual 300 points

Part Number: TPS2640
Other Parts Discussed in Thread: LMR51430, LM76005, , TPS2051

Tool/software:

We are designing a custom PCB with 24 V input. we used TPS26400PWPR for power supply protection. LM76005 is used to convert 24 V to 5 V and LMR51430 is used to convert 5 V to 3.3 V. Also in the design, there is a USB power switch for providing power to external circuit through USB-A connector. Below are the screenshots of the circuit. Please validate the circuits and recommend any changes that are applicable.

0 Amrit Jit 10 months ago

TI__Mastermind 31921 points

Hello Aakash,

Please consider adding Schottky diode at output to protect TSP2640 from negative voltage ringing.

schematic around TSP2640 looks fine to me.

I will assign the thread to responsible org to review synchronous buck schematics.

Thanks

Amrit

0 Aakash Dey 10 months ago in reply to Amrit Jit

Intellectual 300 points

Hi Amrit,

Thanks for your valuable feedback. I will add an schottky diode from output pin of TPS2640 to GND as shown below. Hope that will be fine.

Also, waiting for the feedback on the regulators from the respective team.

0 Aakash Dey 10 months ago in reply to Aakash Dey

Intellectual 300 points

Hi TI Team,

Is there any modification required for LM76005, LMR51430 and TPS2051 Section? Please suggest.