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TPS23755: EVM schemtic

Noriyuki Takahashi
Genius 11040 points
Part Number: TPS23755

Hi team

I have several questions about the evm schematic, I mean, p.4 of below link.

1. Is it no problem to use a ceramic capacitor instead of  an electrolytic capacitor as C12?

2. Why are you using variable resisters as R23&R26? Is it OK to use fixed 20Ohm&100Ohm resisters as R23&R26?

3. Why A1/2/3/4 are connected to RSNS/VSS/VDD/DRAIN? According to datasheet, these pins are just to attach IC on PCB tightly, right?

Regards,

Noriyuki Takahashi

  • 0
    TI__Genius 9230 points

    Hi Takahashi-san,

    1. Generally, an electrolytic capacitor because the ESR provides stability for the DC/DC. On this design, C12 has negligible/unspecified ESR, so a ceramic capacitor can be used in its place. At higher power levels, this would not typically be the case.

    2. We use potentiometers so customers can experiment with different rising & falling slew rates. It is ok to use fixed values.

    3. These structural anchor pins are just located very close to those respective pins. They are non-functional. It simplifies layout to just connect these pins to the closest anchor. Also, it provides some additional copper for thermal dissipation.

    Thanks,
    Tom Amlee
    PD Apps Engineer