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Question about LT3484

Hello. My name is Keita. 

I post this bulletin board for the first time.

I have a question about LT3484.

I'm going to use a step-up transformer ATB322524-0110(TDK).

The IC meeting the condition of this step-up transformer is LT3484-1, but is it all right in LT3484-0 ?

Please tell me which IC I should use. I want to use LT3484-0.

 

Parents
  • Please follow page 8 Data sheet recommendations. 

  • Hi,
    I'm Isao working with Keita.
    We are designing a product using "LT3484-0 or LT3468".
    But, "TDK LDT565630T-001" has been discontinued.
    We are considering using "ATB322524-0110-T000" instead it.
    However, there are differences from the recommended values described in the data sheet,Is it possible to use it?
    Our prototype circuit is working.
    Is there no problem if the prototype circuit can satisfy "Figure 4. New Transformer Design Check" in the data sheet?

    Recommended Transformer Parameters
     Primary Inductance           >5  uH
     Primary Leakage Inductance   100 to 300 nH
     Secondary: Primary Turns Ratio 1:8 to 1:12
     Primary Winding Resistance <300 m ohm
     Secondary Winding Resistance <40 ohm

    TDK ATB322524-0110-T000
     Primary Inductance           7.0±20% uH
     Primary Leakage Inductance   400 nH
     Secondary: Primary Turns Ratio 1:10.2
     Primary Winding Resistance    500 m ohm max
     Secondary Winding Resistance  60 ohm max
     
     

  • It should work, but the peak current should be kept well below 1.5A somewhere in 1.0A range. Looks like at higher currents the ATB322524-0110-T000 enters saturation region.

    The higher winding resistance will have to be tested its impact to efficiency.

  • Hello Fil,

    I have an application with the LT3848-1 and am contemplating using the same transformer as Keita and Piro_gue.

    The specs of the  ATB322524-0110-T000 seem to match the 3484-1 well, except for the primary inductance. (3484-1 recommends >10uH, ATB has 7uH).

    Do you think using this ATB transformer with the 3484-1 would be ok despite the much lower primary inductance?

    Reference values:

    Vout: 160V

    N: 10.2

    Ipk: 0.7A

    According to the formula in the LT3484 spec sheet, the minimum for these values is 4.5uH. So in theory 7 should be fine?

Reply
  • Hello Fil,

    I have an application with the LT3848-1 and am contemplating using the same transformer as Keita and Piro_gue.

    The specs of the  ATB322524-0110-T000 seem to match the 3484-1 well, except for the primary inductance. (3484-1 recommends >10uH, ATB has 7uH).

    Do you think using this ATB transformer with the 3484-1 would be ok despite the much lower primary inductance?

    Reference values:

    Vout: 160V

    N: 10.2

    Ipk: 0.7A

    According to the formula in the LT3484 spec sheet, the minimum for these values is 4.5uH. So in theory 7 should be fine?

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