Texas Instruments provides a recommended PCB layout in the PT7681N datasheet (section 10.2) and in the PT7681N Evaluation Module User's Guide. It's essential to follow these guidelines to minimize noise, ensure proper thermal management, and optimize performance.
The input capacitor values depend on the input voltage, output voltage, and desired ripple current. TI provides a capacitor selection guide in the PT7681N datasheet (section 7.3.1) and in the PT7681N Capacitor Selection Guide application note. Use these resources to determine the optimal capacitor values for your specific application.
The PT7681N can deliver up to 3A of output current, but this depends on the input voltage, output voltage, and thermal conditions. Refer to the PT7681N datasheet (section 6.3) for detailed information on output current capability and thermal derating.
The PT7681N has built-in OCP and SCP features. To implement these features, connect the OCP pin to a resistor divider network that sets the current limit threshold. For SCP, connect the SCP pin to a resistor that sets the short-circuit detection threshold. Refer to the PT7681N datasheet (sections 7.3.4 and 7.3.5) for detailed implementation guidelines.
Proper thermal management is crucial for the PT7681N. Use a heat sink with a thermal resistance of ≤10°C/W, and ensure good airflow around the device. Follow the thermal design guidelines in the PT7681N datasheet (section 10.1) and the PT7681N Thermal Design Guide application note.
