Texas Instruments provides a recommended PCB layout in the LM25101 evaluation module documentation, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
To ensure reliable start-up and shutdown, it is recommended to follow the power sequencing guidelines in the datasheet, including the use of a soft-start circuit and a voltage supervisor to monitor the input voltage and ensure that the device is fully powered up before enabling the output.
The maximum allowable ripple current on the input capacitor depends on the specific capacitor used and the operating conditions. As a general guideline, Texas Instruments recommends limiting the ripple current to less than 10% of the capacitor's rated RMS current to ensure reliable operation and minimize ESR losses.
Yes, the LM25101 can be used with a non-TI inductor, but it is recommended to ensure that the inductor meets the specified inductance, DCR, and saturation current requirements outlined in the datasheet. Additionally, the inductor should be designed to handle the maximum expected current and voltage stresses in the application.
To troubleshoot oscillations or instability in the LM25101 circuit, start by checking the PCB layout and component placement for any potential issues, such as poor thermal design or inadequate decoupling. Next, verify that the input and output voltages are within the specified ranges, and that the feedback loop is properly compensated. If the issue persists, consider using a scope or simulation tool to analyze the circuit behavior and identify the root cause of the instability.
LM25101CMY/NOPB datasheet
by Texas Instruments
