A good PCB layout for the PT4472C involves keeping the input and output traces separate, using a solid ground plane, and placing the input and output capacitors close to the device. Additionally, it's recommended to use a low-ESR capacitor for the output filter and to minimize the loop area of the input and output traces.
To ensure stability, it's essential to follow the recommended component values and PCB layout guidelines. Additionally, make sure to use a sufficient output capacitor value and a low-ESR capacitor for the output filter. Also, avoid using a capacitor with a high ESL (Equivalent Series Inductance) value for the output filter.
The PT4472C can handle a maximum input voltage of 28V, but it's recommended to operate it within the specified input voltage range of 7V to 24V for optimal performance and reliability.
The PT4472C is rated for operation up to 125°C, but it's essential to consider the derating of the output current and the junction temperature when operating in high-temperature environments. Make sure to follow the recommended thermal design and heat sinking guidelines to ensure reliable operation.
The output voltage ripple of the PT4472C can be calculated using the formula: ΔVout = (Iout * ESL) / (Cout * fsw), where 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.
PT4472C datasheet
by Texas Instruments
