A good PCB layout for the BD680 involves keeping the power traces short and wide, using a solid ground plane, and placing the input and output capacitors close to the IC. Additionally, it's recommended to use a shielded inductor and to keep the switching node (SW) away from sensitive analog circuits.
To optimize the compensation network, start by selecting the correct compensation components based on the output voltage and current requirements. Then, use the datasheet's recommended values as a starting point and adjust them based on the specific application's requirements. It's also recommended to use a network analyzer to measure the loop gain and adjust the compensation components accordingly.
The BD680 can handle input voltages up to 18V, but it's recommended to keep the input voltage below 15V to ensure reliable operation and to prevent overheating.
To ensure the BD680 operates within the recommended operating temperature range (-40°C to 150°C), make sure to provide adequate heat sinking, use a thermally conductive PCB material, and avoid blocking airflow around the IC. Additionally, consider using a thermal interface material to improve heat transfer between the IC and the heat sink.
When selecting the output inductor for the BD680, consider the inductor's saturation current, DC resistance, and core material. Choose an inductor with a high saturation current rating to handle the peak current, and select a core material that minimizes core losses. Additionally, consider the inductor's physical size and shape to ensure it fits the PCB layout.
BD680 datasheet
by STMicroelectronics
