Texas Instruments provides a recommended PCB layout in the LM25117QPSQ/NOPB datasheet, which includes a thermal pad connected to a copper plane on the PCB to dissipate heat. Additionally, it is recommended to use a 2-ounce copper PCB and to keep the thermal pad away from other components to minimize thermal resistance.
To ensure proper biasing during startup, it is recommended to add a soft-start circuit to the input voltage (VIN) to prevent inrush currents and to ensure that the device is properly biased. A soft-start circuit can be implemented using a resistor and capacitor in series, connected to the VIN pin.
The maximum output current capability of the LM25117QPSQ/NOPB is dependent on the input voltage, output voltage, and thermal conditions. According to the datasheet, the device can deliver up to 1.5A of output current, but this may be limited by thermal considerations. It is recommended to consult the datasheet and perform thermal calculations to determine the maximum output current capability for a specific application.
To troubleshoot oscillations or instability in the output voltage, check the PCB layout for proper decoupling and routing of the input and output capacitors. Ensure that the input and output capacitors are placed close to the device and that the PCB traces are short and wide. Also, check the output voltage ripple and ensure that it is within the specified limits. If the issue persists, consult the datasheet and application notes for further guidance.
The recommended input capacitor type and value for optimal performance are dependent on the input voltage and frequency. According to the datasheet, a ceramic or film capacitor with a value of 10uF to 22uF is recommended for most applications. However, it is recommended to consult the datasheet and perform simulations to determine the optimal input capacitor value and type for a specific application.
Trust Checks
This model has been provided by community users.
Community Provided
This model has been verified by system checks.
System Verified
This model has been reviewed by community users.
Community Approved
Sponsored
LM25117QPSQ/NOPB Overview
Use the download button to access the LM25117QPSQ/NOPB schematic symbol, PCB footprint, and 3D model.
To find more CAD model downloads similar to this part, try a partial part number search, like LM251,
or try a keyword search, such as Switching Regulator or Controllers
About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
