ZHCSCL9A July 2014 – September 2021 TPS55340-EP
PRODUCTION DATA
As for all switching power supplies, especially those with high frequency and high switch current, printed circuit board (PCB) layout is an important design step. If the layout is not carefully designed, the regulator could suffer from instability as well as noise problems. To maximize efficiency, switch rise and fall times are made as short as possible. To prevent radiation of high-frequency resonance problems, proper layout of the high-frequency switching path is essential. Minimize the length and area of all traces connected to the SW pin and always use a ground plane under the switching regulator to minimize interplane coupling. The high current path including the internal MOSFET switch, Schottky diode, and output capacitor, contains nanosecond rise and fall times and should be kept as short as possible. The input capacitor needs not only to be close to the VIN pin, but also to the AGND pin to reduce the IC supply ripple.