ZHCSLG3C June 2020 – August 2022 TPS7B86-Q1
PRODUCTION DATA
For the adjustable-voltage version device, a feed-forward capacitor (CFF) can be connected from the OUT pin to the FB pin. CFF improves transient, noise, and PSRR performance, but is not required for regulator stability. Recommended CFF values are listed in the Section 6.3 table. A higher capacitance CFF can be used; however, the start-up time increases. For a detailed description of CFF tradeoffs, see the Pros and Cons of Using a Feedforward Capacitor with a Low-Dropout Regulator application note.
CFF and R1 form a zero in the loop gain at frequency fZ, while CFF, R1, and R2 form a pole in the loop gain at frequency fP. CFF zero and pole frequencies can be calculated from the following equations: