Texas Instruments provides a recommended PCB layout in the datasheet, but it's also important to follow general high-frequency PCB design guidelines, such as keeping the input and output traces short and away from each other, using a solid ground plane, and minimizing vias and thermal reliefs.
To ensure stability, make sure to follow the datasheet's guidelines for component selection, particularly the output capacitor and feedback resistors. Additionally, ensure that the input and output capacitors are properly bypassed, and the feedback network is properly compensated.
While the datasheet specifies a maximum input voltage of 50V, it's essential to consider the voltage rating of the internal components and the maximum voltage rating of the device. In practice, it's recommended to limit the input voltage to 40V to ensure reliable operation.
The LM5070MTC-50 is rated for operation up to 125°C, but it's crucial to consider the thermal design and ensure that the device is properly heat-sinked. Additionally, the device's performance may degrade at high temperatures, so it's essential to characterize its behavior under these conditions.
To troubleshoot issues, start by verifying the PCB layout and component selection against the datasheet's recommendations. Then, use an oscilloscope to measure the input and output waveforms, and check for signs of oscillation or instability. Finally, consult the datasheet's troubleshooting section and Texas Instruments' application notes for guidance.
LM5070MTC-50 datasheet
by Texas Instruments
