Onsemi provides a reference design guide for PCB layout and thermal management in their application note AND9407/D. It's essential to follow these guidelines to ensure optimal performance, reliability, and thermal dissipation.
Onsemi recommends using external fault detection and protection circuits, such as over-voltage protection (OVP), under-voltage protection (UVP), and over-temperature protection (OTP). Additionally, implementing a watchdog timer and error detection mechanisms can help detect and respond to faults.
The input capacitor should be a low-ESR, high-frequency capacitor (e.g., X7R or X5R dielectric) with a value between 4.7 μF to 10 μF. The capacitor's quality and value significantly impact the device's performance, stability, and noise immunity. Onsemi recommends following their application note AND9407/D for more information.
To ensure EMC and reduce EMI, follow onsemi's guidelines for PCB layout, component placement, and shielding. Use a multi-layer PCB with a solid ground plane, and consider using EMI filters or common-mode chokes. Additionally, ensure that the device is properly decoupled and that the input and output traces are routed carefully.
The device's thermal derating is critical for reliability. Onsemi recommends derating the device's power dissipation by 1.5% per degree Celsius above 25°C. This ensures that the device operates within its safe operating area and minimizes the risk of thermal-related failures.
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