STMicroelectronics provides a recommended PCB layout in the application note AN4571, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
The input capacitor selection depends on the input voltage, current, and ripple requirements. A general guideline is to choose a capacitor with a voltage rating at least 1.5 times the maximum input voltage, and a capacitance value that ensures the ripple voltage is within the recommended range (typically 10-20% of the input voltage).
The maximum allowed voltage drop across the internal FETs is not explicitly stated in the datasheet. However, as a general guideline, it's recommended to keep the voltage drop below 1V to ensure reliable operation and minimize power losses.
The L6751BTR is rated for operation up to 150°C, but the device's performance and reliability may degrade at high temperatures. It's essential to consider the thermal management and ensure the device operates within the recommended temperature range to maintain its specifications.
To troubleshoot the L6751BTR, start by checking the input voltage, current, and ripple. Verify that the device is properly soldered and the PCB layout is correct. Use an oscilloscope to monitor the output voltage and current, and check for any signs of overheating or electrical overstress.
