The maximum input voltage that can be applied to the TPS54550PWPG4 is 60V, but it's recommended to operate within the specified input voltage range of 4.5V to 50V for optimal performance and reliability.
To ensure stability, follow the recommended layout and component selection guidelines in the datasheet, including the use of a 10uF ceramic input capacitor, a 22uF ceramic output capacitor, and a 1kΩ resistor in series with the output capacitor. Additionally, ensure that the input and output capacitors are placed close to the device and that the PCB layout is designed to minimize parasitic inductance and capacitance.
The minimum ESR required for the output capacitor is not explicitly stated in the datasheet, but a general rule of thumb is to use an output capacitor with an ESR of less than 100mΩ. This ensures that the output capacitor can handle the high-frequency switching currents and maintain stability.
Yes, it's recommended to use a ceramic capacitor with a higher voltage rating than the output voltage to ensure that the capacitor can handle the voltage stress and ripple. A general rule of thumb is to use a capacitor with a voltage rating at least 1.5 times the output voltage.
The output voltage ripple can be calculated using the following formula: ΔVout = (Iout * ESL) / (Cout * fsw), where ΔVout is the output voltage ripple, Iout is the output current, ESL is the equivalent series inductance of the output capacitor, Cout is the output capacitance, and fsw is the switching frequency. The output voltage ripple should be less than 1% of the output voltage for most applications.
TPS54550PWPG4 datasheet
by Texas Instruments
