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LM5066I: LM5066I

Shlomi Yehezkia
Mastermind 6150 points
Part Number: LM5066I

Hi Team,

I design based LM5066IPMHE/NOPB schematic attached.

On new layout revision I added R978,R979 and C947 filter on sense.

I did some measurements and I saw that I have up to 7W reading mistake (marked on red below)

I need to understand why it happen with the filter? I assume that the input is high impedance.

It is really funny that I sum all my external loads (from PSE based TI) and it is more than measured input….

See mail that I wrote to my system …

 

We may need to Add 7W constant to input measurements in order to compensate the external filter – please advise soon when SW will handle

I will open to TI technical question in order to understand the impedance since we added the filter according recommendations.

On revision 0 we didn’t have this filter but we added on Rev 01 since our current ripple is high.

Vinput.docx

10 - MAIN DC POWER SUPPLIES _ M.pdf

Thanks,

Shlomi

  • 0
    TI__Expert 5940 points

    Shlomi,

    See email I sent today on this. In addition, verify the accuracy of the input power measurements (meter, shunt tolelance, etc).  It looks like the full scale measurement is very good.  Review Vsns (mv) accuracy accorss the shunt in the DS.

    This is US holiday so delays in response.

    Brian