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LM3478EVAL: LM3478 does not support enough load current.

Maulik Patel
Prodigy 160 points
Part Number: LM3478EVAL
Other Parts Discussed in Thread: LM3478

I am using EVAL board for my load which is 1AMP. However its shorting out. I tested and seems like it can support max 550mA. Why datasheet says it can support upto 1500mA

  • 0
    TI__Guru 55601 points
    Hello
    It should work well up to 1.5A. Please check the current limit & output regulation accuracy of your power supply.
    Thanks.
  • 0 in reply to EricLee
    Prodigy 160 points

    Hi,

    My power supply can support upto 7A. I am providing VIN 5.2V. My output voltage is 12V. My output known load is 1 AMP. However, I see on my power supply, eval board draws 1.5Amp +...I have current limit set on power supply to be 1.5A, so I don't accidentally damage my EVAL board. If I increase my current limit on power supply, it might work. But EVAL board drawing lots of current. That is bad efficiency. Can you please confirm 1.5A of load current works on Eval board? I recently got this new EVAL board of LM3478.

    -Maulik

  • 0 in reply to Maulik Patel
    TI__Guru 55601 points
    Hello
    Iin= Vout*Iout/Vin. 12V * 1.5A / 5V = 3.6A if the efficiency is 100%
    Assuming 80% efficiency, your average input current will be about 4.5A.
    Assuming 30% margin, my recommendation is to increase your power supply's current limit to 6A.
    Thanks