Vout calculation of LT3080

Hello

           Below is customer condition. Customer would like to know 5Vout range at -40C, 25C, 125C temperature. How to use below chart and formula to calculate 5V output voltage range at these temperatures? Thank you. 

>Vin=15V, Vout=5V, ILOAD=100mA

>-40C, 25C, 125C temperature

BR

Patrick

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  • +1
    •  Analog Employees 
    on Jan 6, 2021 5:52 PM 1 month ago

    Thanks for the post.  According to the graph you show above, the customer's output voltage load regulation will be best around room temperature and the error due to load regulation will increase a bit at both extreme cold and hot temperatures.  The output voltage error due to the reference current effect on load regulation will be about -10uA/10nA = -0.001 = -0.1% worst case.  The output voltage error due to the error amplifier offset voltage effect on regulation will be about -4mV worst case.  The effects of the current reference and offset voltage are additive.  Reference the block diagram for the LT3080 from the datasheet.  From my understanding, the LT3080 accuracy can be summarized as +/-2% over all effects.

    LT3080 DS block_1.png

Reply
  • +1
    •  Analog Employees 
    on Jan 6, 2021 5:52 PM 1 month ago

    Thanks for the post.  According to the graph you show above, the customer's output voltage load regulation will be best around room temperature and the error due to load regulation will increase a bit at both extreme cold and hot temperatures.  The output voltage error due to the reference current effect on load regulation will be about -10uA/10nA = -0.001 = -0.1% worst case.  The output voltage error due to the error amplifier offset voltage effect on regulation will be about -4mV worst case.  The effects of the current reference and offset voltage are additive.  Reference the block diagram for the LT3080 from the datasheet.  From my understanding, the LT3080 accuracy can be summarized as +/-2% over all effects.

    LT3080 DS block_1.png

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