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LM5156-Q1: Line/Load Regulation

Sunney Kumar
Prodigy 60 points
Part Number: LM5156-Q1

Hi TI team,

I am using LM5156-Q1 boost converter and wanted to calculate the Line/load regulation of the converter, but with the available formula I think I am not getting the correct value. Also for switching regulators do we get such data in datasheets as a specification?

Vin = 5.7V to 6.3V; Vin_typ = 6V

Vout = 12V

Formula used are:

Line regulation = [delta Vout / delta Vin] x 100%

OR

Line regulation = ((delta Vout / Vout) x 100%) / (delta Vin)

And

Load Regulation = (V.No_Load - V.Full_Load)/(V.Full_Load) * 100%

Is this the right way to calculate the line/load regulation for boost converter?

Regards,

Sunney

  • 0
    TI__Genius 10375 points

    Hi Sunney,

    Thank you for using E2E forums, may I know where did you get these formulas from? Could you also explain what do you mean by load and line regulation, I am a bit confused?

    BR,

    Haroon

  • 0 in reply to Haroon Wardak
    Prodigy 60 points

    Hi Haroon,

    These are standard formulas to calculate line load regulation. The one which I mentioned, they are just from google search.

    Usually line load regulation is given for off the shelf power supply modules but since the part in question is boost converter IC, I am not expecting the datasheet should contain those values.

    however my question is, if I have to calculate Line/load regulation for power supply which is designed using  LM5156-Q1 . How to calculate it.

    ALso Line Regulation: Line regulation is the ability of a power supply to maintain a constant output voltage despite changes to the input voltage

    Load Regulation: Load regulation is the capability to maintain a constant voltage (or current) level on the output channel of a power supply despite changes in the supply's load 

  • 0 in reply to Sunney Kumar
    TI__Genius 10375 points

    Hi Sunney,

    Thank you for your reply, ok so you are talking about the general stability of the system against load and line transients. There is no formula for that I am afraid, normally the compensation circuit on the COMP pin takes care of that with the cross over frequency and phase margin of the bode plot. you can calculate that yourself using the datasheet or by using one the quickstart calculators on our website https://www.ti.com/product/LM5156 

    Here is an interesting paper on this topic https://www.ti.com/lit/an/slva381b/slva381b.pdf 

    Please have a read and if there any any further question do let me know.

    BR,

    Haroon