Description:Built−in 700 V MOSFET with RDS(on) of 12 Ω; Large Creepage Distance Between High−voltage Pins; 780 mA Peak Current; Direct Feedback connection for non-isolated converter; Auto-Recovery Output Short Circuit Protection with Timer-Based Detection; Frequency Jittering; Current−Mode Fixed Frequency Operation – 60 or 100 kHz; Skip-Cycle at low peak currents; Dynamic Self−Supply
The recommended PCB layout for optimal thermal performance involves placing the device on a 2-layer or 4-layer board with a solid ground plane on the bottom layer, and using thermal vias to connect the exposed pad to the ground plane. Additionally, keeping the copper traces wide and short can help to reduce thermal resistance.
To ensure reliable start-up of the converter, it is recommended to add a soft-start circuit to limit the inrush current during start-up, and to use a sufficient input capacitance to filter out voltage transients. Additionally, the input voltage should be ramped up slowly to prevent excessive inrush current.
The maximum allowed output capacitance for stable operation depends on the specific application and the desired output voltage ripple. As a general rule, the output capacitance should be limited to 10uF to 22uF to ensure stable operation. However, it is recommended to consult the application note and perform stability analysis to determine the optimal output capacitance for the specific design.
To troubleshoot oscillations or instability in the converter, it is recommended to check the PCB layout for any signs of resonance or noise coupling, and to verify that the input and output capacitors are properly selected and placed. Additionally, the loop gain and phase margin should be measured to ensure that the converter is stable. If the issue persists, it may be necessary to add additional compensation components or to modify the feedback network.
The recommended input filter design to minimize EMI emissions involves using a pi-filter or a common-mode choke in combination with X-capacitors and Y-capacitors. The filter components should be selected based on the specific application and the desired EMI performance. Additionally, it is recommended to follow the guidelines provided in the application note and to perform EMI testing to ensure compliance with the relevant standards.
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NCP10672BD100R2G Overview
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