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UCC28951: UCC28951: Design Equation Correction

Part Number: UCC28951

Tool/software:

The connection of a resistor to the SS/EN pin cause an exponential relationship in the capacitor voltage (parallel resistor and capacitor with constant current source)

The voltage equation of the capacitor should be:

The time Tss required for this network to reach 0.55 + VEA+ can be found by substituting into the above equation:

solving for Css give us the following equation:

and since RSS = 825kohm, then we get the same equation as (2) without 25uA in the numerator: