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Maximum input voltage of LM2587

Takahiro Nishizawa
Genius 5575 points

I have questions about LM2587S-ADJ.

　Vout=12

    Iout=0.6

     It is not flyback. 

     Circuit is such as Figure.8  datasheet p.3.

Question1

- Please tell me the maximum input voltage under the above conditions.

Question2

- Please tell me the reason of answer Question1.

Question3

- Do you have the data of minimum on-time and minimum off-time?

Best regards,

  • 0
    TI__Mastermind 21720 points
    Hi Takahiro,

    The VIN pin is rated for 45V. This would be the maximum input voltage. The SW pin is rated for 65V due to the output voltage of a flyback converter being reflected back to the primary side in addition to the input voltage.

    Let me gather the data for minimum on and off time data. Please not that the maximum duty cycle is listed on page 8 of the datasheet.

    Thanks,

    Garrett