Texas Instruments provides a recommended PCB layout in the TPS54429EPWP datasheet, but it's also recommended to follow general high-frequency PCB design guidelines, such as using a solid ground plane, minimizing trace lengths, and using vias to connect layers. Additionally, it's recommended to place the input and output capacitors close to the device and to use a Kelvin connection for the sense lines.
The selection of input and output capacitors depends on the specific application requirements, such as the input voltage range, output voltage, and output current. In general, it's recommended to use low-ESR capacitors with a high ripple current rating. The datasheet provides some guidance on capacitor selection, but it's also recommended to consult the capacitor manufacturer's datasheet and to perform simulations to ensure the capacitors meet the requirements.
The TPS54429EPWP is rated for operation up to 105°C ambient temperature, but the maximum ambient temperature for reliable operation depends on the specific application and the thermal design of the system. It's recommended to perform thermal simulations and to consider the thermal derating of the device to ensure reliable operation.
The TPS54429EPWP has a built-in overcurrent protection feature, but it's also recommended to implement external overcurrent protection using a sense resistor and a comparator or a dedicated overcurrent protection IC. The sense resistor should be placed in series with the output inductor and the comparator should be set to trigger at a current level slightly higher than the maximum output current.
The recommended startup sequence for the TPS54429EPWP is to first apply the input voltage, then the enable signal, and finally the clock signal. This ensures that the device is properly biased and configured before the clock signal is applied.
TPS54429EPWP datasheet
by Texas Instruments
Findchips
