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A problem about LM5000

Hongpei Liu
Intellectual 370 points
Other Parts Discussed in Thread: LM5000, LM5035, LM5045

Hi Sir,

I want to use LM5000 to generate 200v voltage.

I checked the datasheet which said that can generate 2A output current.

I'm wondering with 2A current, the output power can get to 400w.

So is the current direct from the source or the output current is related to the output voltage?

Thanks.

Jason.

  • 0
    Intellectual 370 points

    Anybody can help?

    Thanks.

    Jason.

  • 0
    TI__Guru* 78110 points

    The datasheet says the internal power switch ... with a current limit set to 2A.  The 2A limit is not converter's output current limit.  The internal switch will be turned off when the peak limit is reached each cycle to protect against over loading.  I don't think you can use LM5000 to get that big power.  For high power, you should consider double ended topology. See LM5035, LM5045, etc.

    Thanks,

    Youhao Xi, System/Applications Engineering, Texas Instruments SVA-PPD

  • 0 in reply to Youhao Xi
    Intellectual 370 points

    Thank you for your reply.
    The source input is 5v. So it's more convenient for me to use LM5000.
    What do you think the output current Lm5000 can offord?

    By the way. How high voltage can LM5000 get?

    Thanks.

    Jason.

  • 0 in reply to Hongpei Liu
    TI__Guru* 78110 points

    5V input?  depending on the magnetics that you select, the 2A peak limit does not allow you to process 10W at this input.  Use max duty cycle, and 2A pk to calculate your maximum allowable input current, and your expected efficiency, then you can get an idea of the power level. 

    Thanks,

    Youhao Xi, System/Applications Engineering, Texas Instruments SVA-PPD