JAJSHS0C March 2019 – March 2021 TPS92682-Q1
PRODUCTION DATA
The input capacitor is required to reduce switching noise conducted through the input terminal and to reduce the input impedance of the CV Boost. Equation 44 is used to calculate the required capacitance of CIN ≥ 70 µF to limit peak-to-peak input voltage ripple, ΔvIN(PP), to 10 mV.
Eight 10-µF, 50-V ceramic capacitors are used in parallel to achieve a combined input capacitance of 80 µF. As shown in Figure 8-24, an additional 33-µF, 50-V electrolytic capacitor and a 1-µH inductor are also used at the input terminal. The electrolytic capacitor is used to further decrease overshoot and undershoot during load transient. The input inductor is used to decrease the switching noise and improve EMI performance.