Please tell me the meanings of ∆COUT2, ∆COUT3, TOLERANCE COUT3, and ∆COUT3_POS in the datasheet.
Lin,
Temperature, tolerance, aging and DC bias can all result in capacitor value change. ∆COUTx refers to the worst case expected capacitor variation (Cx_max-Cx_min). The variation in capacitance creates a variation in charge (Q=C*V). For a split capacitor output such as biasing a SiC/IGBY gate driver, it is important to maintain charge balance between the VDD-COM and VEE-COM capacitors. Tolerance COUTs refers to only the expected tolerance of the capacitor type chosen (5%, 10%, 15%, etc). The Excel design tool found in the UCC14341-Q1 product folder uses the variables you are asking about and the equations from the data sheet to calculate the optimal capacitor, RLIM and feedback resistor component values. The equations in the data sheet are given to make known to the designer where the spreadsheet results are coming from.
Regards,
Steve
