A good PCB layout for the UA9638CD involves keeping the input and output traces short and separate, using a solid ground plane, and placing decoupling capacitors close to the device. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
To ensure proper biasing, connect the VCC pin to a stable voltage source, and decouple it with a 0.1uF capacitor to ground. The VBIAS pin should be connected to a voltage divider network that sets the desired output voltage. The voltage divider should be designed to provide a stable voltage reference.
The UA9638CD requires a 50-ohm input termination to ensure maximum power transfer. A 50-ohm output termination is also recommended to prevent signal reflections. Use a 50-ohm resistor in series with the input and output pins to achieve this.
The UA9638CD can dissipate up to 2.5W of power. To manage thermal issues, ensure good airflow around the device, and consider using a heat sink or thermal pad to dissipate heat. Keep the device away from other heat sources and ensure the PCB is designed for good thermal conductivity.
The UA9638CD has internal ESD protection, but it's still important to follow proper ESD handling procedures during assembly and testing. Use an ESD wrist strap or mat, and ensure the PCB is properly grounded to prevent static discharge.
uA9638CD datasheet
by Texas Instruments
