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WEBENCH® Tools/LM5088: DC-DC converter design

Santosh Singh82
Prodigy 20 points
Part Number: LM5088
Other Parts Discussed in Thread: LM5116

Tool/software: WEBENCH® Design Tools

Hi,

I want to design a DC-DC converter with 40v to 70v as input and 12v/5A as output. I searched TI website and found LM5088 suitable. Then I used the WEBENCH tool to simulate and get the components values. Now, can I implement the same WEBENCH values to get start my design? And, should I follow the exact layout guidelines? What if I want to change the form factor of the PCB? Does WEBENCH design include input/output protections?

OR, is there any other ICs / solution available suiting my requirement? Please reply.

Thank you,

Santosh

  • 0
    TI__Prodigy 700 points
    Hi Santosh,

    a) Yes you can start with the Webench values for your design.
    b) In the datasheet are PCB layout guidelines you should follow. You can order an EVM as well and then change the components to your needs. Please make sure that all high voltage components, for example input caps have sufficient voltage rating of 100V for your 70Vin design.
    c) The LM5088 has several internal protections described in the datasheet. The LM5088 Webench design schematic contains no additional external protections or EMI filter. The EMI filter can be added in Webench tool.
    d) In the product folder of LM5088 you find a white paper www.ti.com/.../slyy104.pdf
    that shows LM5116 a Synchronous Buck Controller alternative.

    Best Regards,
    Robert L
  • 0 in reply to Robert Loke
    Prodigy 20 points

    Hi Robert,

    Thanks a lot for the reply. Actually I have a DC-DC converter designed using BD9611MUV from ROHM. The converter IC fails sometimes when I perform hot plug in multiple times with or without load at 53v. This converter IC has absolute maximum of 60v. I am afraid that I am using the converter at boundary region, that's why it fails.

    Now, I found LM5088 which can accept inputs up to 75v which is well above my input voltage level. So, considering the WEBENCH design values, what other cares can I take in my design so that it wont fail in tests like (i) hot plug in multiple times with or without load, (ii) at overload etc?

    Thanking you,

    Santosh