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UCC28730: Calculator Sheet

Kara Haynes
Prodigy 560 points
Part Number: UCC28730

I put in my target voltage of 14.4V and the excel sheet determines the MIN and MAX.  +/- 0.72V is too much for what I need tightening this up?  Are any of the other ICs tighter?  I can correct for this but it means over designing the power supply for my needs.  If I make the minimum output 14.4V and measure it on the micro.  Based on how far over the 14.4V I then determine a duty cycle to switch in a series resistor and just measure battery voltage to get me where I need to be.  This gets a bit messy but can work.

For the cable compensation pin how do I best minimize the effect of this?  I am planning for very short wires and will use respectable gauge wire.  Looking at the calculations in the data sheet I am not calculating good values so I must be using an incorrect number.  Using the TI excel calculator as I decrease V_OCBC the R_CBC goes up but is there any realistic bounds I should be aware of?  

  • 0
    TI__Expert 4015 points

    Hi Kara, the +/- 5% regulation is over load and line and accounts for part-part variation as well. The reference itself is +/- 1% accuracy. For battery charging applications this kind of accuracy is usually sufficient.

    Per section 6.5 of the datasheet, the minimum cable compensation occurs when the CBC pin is left open.

    Hope this helps.

    Thanks

    Billy