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LM25037-Q1: DC to DC output -20kv @ 4W supply

Davinder Singh
Prodigy 30 points
Part Number: LM25037-Q1
Other Parts Discussed in Thread: UCC28700, LM25037

Tool/software:

Hi Team,

Need support to design DC to DC isolated -20KV @4W output. Input 8 to 18 V DC.

  • 0
    TI__Guru 73215 points

    Hi,

    If you need to get a reference design, please contact your local TI office. We do not offer reference design on E2E.

    If you have specific questions on the IC and related design issues, please specify and describe so we can provide our reply to help.

  • 0 in reply to Hong Huang
    Prodigy 30 points

    Hi, 

    Do you have any design calculation excel sheet? Will start with 1kV design and later extend it for other voltage. Can we use this part to generate 1kV AC output and still support secondary side regulation?

  • 0 in reply to Davinder Singh
    TI__Guru 73215 points

    Hi,

    Your specs are DC to DC isolated -20KV @4W output. Input 8 to 18 V DC. But this device is not a good option for this specs since its wattage is very small. Usually a flyback can be used for the specs you provided such as UCC28700. What do you mean AC output? There is no specs for AC output in your previous message.

    We do not have a calculation sheet for LM25037 but we have calculation sheet for UCC28700, 

    dr-download.ti.com/.../sluc408b.zip

  • 0 in reply to Hong Huang
    Prodigy 30 points

    Hi,

    What do you mean AC output? Want to generate 1kV (close to square or sine wave) as output. Do you have any other part suggestion, to better obtain this output?

    Thanks.

  • 0 in reply to Davinder Singh
    TI__Guru 73215 points

    Hi,

    What is your AC square specification? Is your converter with DC output or AC output? Why do you specify "Need support to design DC to DC isolated -20KV @4W output. Input 8 to 18 V DC." at beginning of this thread? 

    I am not clear what you are looking for? Is it a dc-dc converter or an dc-ac inverter?

  • 0 in reply to Hong Huang
    Prodigy 30 points

    Hi,

    Thanks for the reply.

    As mentioned in my second reply. We are splitting the design in two stages.

    First stage will use dc- ac inverter for 1kV output and

    in second stage, we will use multiplier to generate ac to dc of -20kV output.

    Application domain is automotive, and automotive grade component available till 2.5kV for this domain (capacitor and diode).

  • +1 in reply to Davinder Singh
    TI__Guru 73215 points

    Hi,

    In such a case, LM25037 push-pull converter can provide dc-ac but ac is in square wave if you want to get sinusoidal, you need to add L-C filter to filter high frequency. So a push-pull should be used which can produce symmetrical positive and negative square waveform.