ZHCSJH2E November 2007 – April 2019 TPS61165
PRODUCTION DATA.
As for all switching power supplies, especially those high frequency and high current ones, layout is an important design step. If layout is not carefully done, the regulator could suffer from instability as well as noise problems. To reduce switching losses, the SW pin 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 inter-plane coupling. The loop including the PWM switch, Schottky diode, and output capacitor, contains high current rising and falling in nanosecond and must be kept as short as possible. The input capacitor must be close to both the VIN pin and the GND pin to reduce the device supply ripple. Figure 20 shows a sample layout.