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LM2592HV: WEBENCH®︎ POWER DESIGNER and LM2592HV

Marco Aversa
Prodigy 50 points
Part Number: LM2592HV
Other Parts Discussed in Thread: LM2576HV,

Tool/software:

Hi,

I need to replace the components of a LM2576HV TO220 based buck power supply with these specs Vin: 48V, Vout:45V, Iout:1.5A
I would like to use an LM2592HV which would allow me to reduce the inductance by having a switching frequency of 150kHz.
I wanted to simulate this power supply with WEBENCH®︎ POWER DESIGNER but they won't accept solutions with a voltage higher than Vout=40V

Can you confirm that it is not possible for LM2592HV to have Vin = 48V and Vout around 45V?

Thank you

Marco

  • 0
    TI__Expert 5490 points

    Hi Marco,

    Let me check if this design inputs are feasible and get back to you.

    Thanks,

    Nitya

  • +1 in reply to Nityanand Hegde
    TI__Expert 5490 points

    Hi Marco,

    I tried to replicate this on WEBENCH with above conditions. Even i see similar behavior.  However i believe 48Vin and 45Vout is feasible. Here is a efficiency graph of multiple inputs w.r.t input voltage. 

    For 48Vout, the input can be as low as 50Vin. So 45Vout with 48Vin is very much possible as per this graph. 

    Thanks,

    Nitya

  • 0 in reply to Nityanand Hegde
    Prodigy 50 points

    Hi Nitya,

    Sorry for the delay in giving you a feedback... we were closed for the summer.
    Thanks for the reply and the documentation, but it would be very convenient for me to be able to use WEBENCH®︎ POWER DESIGNER with LM2592HV in the range of use that I reported to you.
    To date, if I set Vin=48V and Vout=45V it doesn't work.

    EDIT:

    from the tests I did it seems that regardless of the input voltage (example 48V, 50V... 60V) it does not accept output voltages greater than 40V. I believe there is a set limit of 40V and I hope it is easily changeable.


    Thanks for your availability
    Marco

  • 0 in reply to Marco Aversa
    TI__Expert 5490 points

    Hi Marco,

    WEbench does not accept the above use cases as mentioned previously. If customer is ok, we can review the schematic  once it is done.

    Thanks,

    Nitya