A good PCB layout for the L9997ND involves keeping the power traces short and wide, using a solid ground plane, and placing the input and output capacitors close to the device. It's also recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
The choice of input and output capacitors for the L9997ND depends on the specific application requirements. In general, X5R or X7R ceramic capacitors with a voltage rating of 10V or higher are recommended. The capacitance value should be at least 10uF for the input capacitor and 22uF for the output capacitor.
The L9997ND can operate in an ambient temperature range of -40°C to 150°C. However, the device's performance and reliability may be affected at extreme temperatures. It's recommended to operate the device within a temperature range of -20°C to 85°C for optimal performance.
To ensure the L9997ND is properly configured, refer to the datasheet and application notes provided by STMicroelectronics. It's also recommended to use the device's evaluation board or a similar reference design to test and validate the configuration before implementing it in a custom design.
To ensure EMI and EMC compliance when using the L9997ND, it's essential to follow proper PCB layout and design practices, such as using a shielded enclosure, minimizing loop areas, and using EMI filters. Additionally, the device's switching frequency and output voltage should be carefully selected to minimize electromagnetic interference.
L9997ND datasheet
by STMicroelectronics
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