Texas Instruments provides a recommended PCB layout in the application note SLUA433, which includes guidelines for component placement, trace routing, and grounding to minimize EMI and noise.
The input capacitor should be chosen based on the input voltage ripple, output current, and switching frequency. A general rule of thumb is to use a capacitor with a capacitance value of at least 10uF and a voltage rating of 1.5 to 2 times the input voltage. Additionally, the capacitor should have a low ESR (Equivalent Series Resistance) to minimize voltage ripple.
The maximum output current of the UCC29411D is dependent on the input voltage, output voltage, and switching frequency. According to the datasheet, the maximum output current is 1.5A, but this can be derated based on the specific application conditions. It's recommended to consult the datasheet and perform thermal calculations to determine the maximum output current for a specific design.
The UCC29411D can be synchronized with an external clock signal through the SYNC pin. The SYNC pin should be connected to a clock signal with a frequency range of 100 kHz to 1 MHz, and a duty cycle of 50%. The clock signal should be applied to the SYNC pin through a resistor and capacitor network to filter out noise and ensure proper synchronization.
The EN (Enable) pin on the UCC29411D is used to enable or disable the device. When the EN pin is high, the device is enabled and operates normally. When the EN pin is low, the device is disabled and enters a low-power shutdown mode. The EN pin can be used to implement power sequencing or to turn off the device during periods of low power consumption.
UCC29411D datasheet
by Texas Instruments
