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LM5017: isolated 15V DCDC PWR supply

Part Number: LM5017

Hello,

my customer is currently designing an isolated PWR supply for their gate driver and is looking at using the LM5017 for this.

Here are the specifications of their 15V DCDC:

Vin: 16 – 30Vdc

Vout min = 16.5V (to be used with a low cost LDO to get a stable 15V)

Vout max: around 20V to limit losses in LDO

I out: 0.3A max

To do some quick testing, they mounted their transformer (i prefer to send share the transformer details offline) on the EVM AN-2204.

They  got an output voltage by connecting in serial both secondary windings of the transformer.

Because they are not comfortable with their first test, They would like to ask you if you could have a look and confirm that it is possible to reach their specifications with this LM5017 and their transformer.

Or if it is preferable to use another dedicated transformer.

thanks for you support.

Regards,

Stani

  • Hello Stani,

    Please send your information to robert.blattner@ti.com

    Regards, Robert
  • In reply to Robert Blattner:

    Hi Robert,
    i just sent you the info.
    Regards,
    Stani
  • In reply to Stani Bell Ngoufack Tchoufack89:

    Hello Stani,

    Although the configuration for the transformer that you describe is OK and will give the approximately 1:2 turns ratio that you need, the transformer itself has a very low saturation current when used as an inductor. Even if there is no load on the primary, during startup and transients, it is likely that your inductor will saturate. We recommend the use of a product like the Wurth 750314226 – datasheet available on the web. If your customer would like a greater selection of inductors and more design background, try our web page on flybucks: www.ti.com/.../overview.html . The technical documents tab includes a transformer selection guide.

    Regards, Robert
  • In reply to Robert Blattner:

    Hi Robert,

    thanks for your feedback. I'll give feedback to my customer.

    Regards,

    Stani

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