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TPS54332 Chenging Webench components values

Other Parts Discussed in Thread: TPS54332

Hi I am designing a 5V 3A DC-DC converter using TPS54332. Input will be 24V. Web bench has recommended me following values but this value components are not available locally. So i am replacing them with nearest standard values can can any one verify weather circuit will properly or not? Following are the values 

Rcomp 66.5 kOhm replacing it with 67K

Rfbb 1.96 kOhm replacing with 2K

Rfbt 10.2KOhm replacing it with 10K

Ccomp 430pF replacing it with 470pF

Diode VF@Io= 700.0 mV VRRM= 60.0 V replacing with 800mV 80V diode. (s5310)

and power inductor of 5uH

webench_design_1188967_39_82446432.pdf

  • Hi Suyog,

    You can change the components in the BOM view. Click on the BOM button in the top navigation bar, and click ‘Select Alternate Part’ beside the component you want to change

    You will see a list of alternate parts. If you see a suitable component, click on the ‘Select’ button beside the component to use it in your design.

    If you do not find your desired component in the list, click on the red ‘Create a Custom Part’ button on the bottom left of the ‘Alternate Parts’ page to specify the details of your custom component.

    When you replace a component in your design, the ‘Operating Values’ table is updated to reflect the design with the new components, so you can see how the components affected the phase margin, crossover, inductor ripple, and other values.

    Please give the above a try and let us know if you have more questions.

    Kris

  • I workes. Now its calculating that my output will be 4.8V this looks promising. Will go ahead with prototype and update you on its performance.
  • Hi
    I have created this design and as expected i am getting 4.8V! I have one more question about Diode, can i use diode with more than 0.7V ?
  • Hi Suyog,
    What diode forward voltage are you thinking of using? We do not have hard, tested limits on what diode forward voltages are allowed with this device, but note that higher diode voltage will drop the efficiency. For the reason of efficiency alone, you typically want to stay below 0.7V. You also have to make sure you do not hit Vout limitations per equations 33 and 34 in the TPS54332 datasheet.

    Kris
  • Hi
    0.7V diode was not in stock so I used 0.8V diode. But for production i can keep stock of 0.7V diodes