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PMP10666: Output to 74V

Karan
Prodigy 100 points
Part Number: PMP10666

What are the changes to be to present circuit if i want Vout = 74V @ 100 mA. Can i use the same transformer for the mentioned voltage. ? 

My Vin = 4V, Expected Vout = 74V @ 0.1A.

)

Thank you

  • +1
    TI__Intellectual 820 points

    Hi Karan,

    If you want to change Vout = 74V @ 0.1A, change the value of R18 from 2.74k to 4.42k (the closest standard 1% value). It's recommended to only change the bottom output divider resistor and not the top resistor because changing the bottom resistor value this should not effect loop gain (and stability). The same transformer will be perfectly fine, since you are lowering the max output power level from 12W to 7.4W. If you were increasing output power >12W, a new transformer may be required along with other changes. Hope this helps.

    Regards,

    John Betten

  • 0 in reply to John Betten
    Prodigy 100 points

    Thanks for the reply sir, this is really helpfull. I have one more doubt,

    The XFRMR details mentioned in the schematic says Primary Inductance=1.5 uH & EE16 Core, and turns ratio is 1:15. But, What is the operating flux density of the core, so that i can calculate the no.of turns in primary and secondary, to get desired inductance as mentioned in schematic.

    Thankyou

  • +1 in reply to Karan
    TI__Intellectual 820 points

    Karan,

    Unfortunately, I do not have that level of detail on the transformer (part number Wurth 750315626). Please contact Wurth directly about any technical information about it since they are the primary designer of it and should be able to help you. One possible Wurth contact is:

    Swaroop (Swaroop.Vaidyanath@we-online.com)

    750315626

    A very useful power supply design tool is Power Stage Designer. You might consider downloading from TI (free download) because you may find it helpful if you plan to update this design.

    POWERSTAGE-DESIGNER

    750315626.pdf