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LM5022: BOOST CONVERTER DESIGN - CHANGING / GETTING DESIRED OUTPUT - REG

SUBASH S
Prodigy 50 points
Part Number: LM5022

Hi,

REQUIREMENT:

Vin = 15 V;

Vout = 24 V;

Iout = 6 A;

HERE I'M ATTACHING MY CIRCUIT. 

MY PROBLEM:

I'M GETTING 28 V AS MY OUTPUT. I WANT TO CONTROL MY OUTPUT TO 24 V.

PLEASE GUIDE ME WHAT TO CHAGE IN MY DESIGN SO AS TO GET A DESIRED OUTPUT OF 24 V.

Thanks in advance

  • 0
    TI__Genius 10385 points

    Hi Subash,

    Thank you for using E2E forums, regarding your query the FB voltage divider is not set to the right values in order for you to get 24V output. According to my calculation with the current set up you will get around 27V to 26V output. Maybe check your FB voltage divider circuit? The FB voltage reference is 1.25V on average so I would recalculate the FB divider circuit.

    Thank you

    Regards,

    Haroon

  • 0 in reply to Haroon Wardak
    Prodigy 50 points

    @haroon, Thanks for the reply. What should be the voltage at the FB pin.? what changes the output? is it RT resistor? or Comp resistor and capacitors? 

  • 0 in reply to SUBASH S
    TI__Genius 10385 points

    Hi Subash,

    The Vout is changed by changing the FB divider circuit, the upper resistor and the lower resistor that makes the voltage divider and based on the resistance values and the fact that the FB pin will have 1.25V on average you can calculate the Vout.

    BR,

    Haroon

  • 0 in reply to Haroon Wardak
    TI__Genius 15425 points

    Hello Subash,

    I have not seen an update from you for the last 24 days, so I assume the questions are answered and the issue is solved.
    I close this thread now. If there is still something open, please reply and the thread will get opened again.
    If you have any other question or of the thread has been locked, please open a new one.

    Clicking the Resolved Button also helps us to maintain this forum.

    Best regards,
    Harry

  • 0 in reply to Harry Hofner
    Prodigy 50 points

    issued is solved