LM5143: slope compensation calculation

Colin Chen

Genius 15851 points

Part Number: LM5143

Hi team,

Customer has a question about slope compensation in LM5143 datasheet as shown below.

I don’t know how this formula come out and could you please help explain it?

Thanks

Colin

over 2 years ago

+1 Timothy Hegarty over 2 years ago

TI__Guru 63107 points

Hi Colin,

This equation sets the inductance such that the inductor current downslope matches the internal slope compensation (which is the ideal condition). The inductor current slope Vout/L times the Rs is simply made equal to Internal slope in mV/us given in the EC table.

Regards,

Tim