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TPS54424: Design Review

Ranjana Naik1
Prodigy 180 points
Part Number: TPS54424

Hi,

I do need the design review for TPS54424 circuit.

Regulator  Design Efficiency
TPS54424 0.84V @ 2.5A 85.12%
TPS54424 1.8V @ 1.4A 90.52%

0.84V:

1.8V:

Kindly help with the design review of the same. 

Regards,

Ranjana Naik

  • 0
    TI__Genius 14455 points

    Hi Ranjana,

        Can you please share the WEBENCH design for these 2 applications?

    Also, can you give us information on the following.

    1. DC voltage tolerance (% or mV)

    2. Output ripple requirement (% or mV)

    3. Output transient (undershoot, overshoot) requirement (% or mV)

    4. Transient load step size to meet transient (% or mV)

    5. Max operating ambient temperature.

    Regards,

    Gerold

  • 0 in reply to Gerold Dhanabalan - Online Design Tools
    TI__Mastermind 35115 points

    Hi Ranjana,

    I have taken a brief look and everything looks as expected. I did not do any actual calculations for the component values but they look to be in the typical range. If you need help with calculating the values I suggest either WEBENCH or the equations in the apps section of the datasheet. If there is any specific challenges you need this design to meet let us know and I can help take a closer look.

    Two component placeholders which would be good to add are:

    1. Feedfoward capacitor in parallel with the top resistor in the FB divider. This can help with tuning the transient response if needed.
    2. 0 Ω resistor in series with the BOOT pin and the 100 nF cap. If you have any issues caused by non ideal pcb layout, populating this with a 2.2-4.7Ω resistor can help.

    Anthony

  • 0 in reply to Gerold Dhanabalan - Online Design Tools
    Prodigy 180 points

    Hi Gerold,

    1. DC voltage tolerance (% or mV) : 12V with +/- 5% tolerance

    2. Output ripple requirement (% or mV) : less than 50mV

    3. Max operating ambient temperature.: Max 30C

    Webench design is as below:

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=27B93B0CBD8CBC31 

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=B066439EB18630A7 

    Regards,

    Ranjana

  • 0 in reply to Anthony F
    Prodigy 180 points

    Hi Anthony,

    Thanks for the feedback. 

    I will incorporate 2 placeholders mentioned - feedforward capacitor and 0 ohm resistor in the design.

    Regards,

    Ranjana