A good PCB layout is crucial for the LT5525EUF's performance. It's recommended to follow a 4-layer stackup with a solid ground plane, keep the input and output capacitors close to the IC, and use short, wide traces for the high-frequency signals. A demo board or evaluation board can serve as a reference for the layout.
The input filter design depends on the specific application's requirements. A good starting point is to use the recommended component values in the datasheet, and then simulate and optimize the filter using tools like LTspice or other filter design software. Consider factors like input impedance, noise rejection, and component tolerances.
The datasheet doesn't specify a maximum allowed input voltage ripple, but as a general rule, it's recommended to keep the input voltage ripple below 1% of the nominal input voltage to ensure stable operation and minimize output voltage ripple.
The LT5525EUF is rated for operation up to 125°C, but the maximum junction temperature (TJ) should not exceed 150°C. Ensure proper thermal design, including heat sinking and airflow, to keep the junction temperature within the specified range.
Common issues like oscillations or instability can be caused by poor PCB layout, inadequate input/output filtering, or incorrect component values. Use an oscilloscope to measure the input/output waveforms and identify the source of the issue. Consult the datasheet and application notes for troubleshooting guidelines and simulation tools like LTspice can also be helpful.
LT5525EUF datasheet
by Linear Technology
