Description:Built−in 700 V MOSFET with RDS(on) of 34 Ω; Large Creepage Distance Between High−voltage Pins; 250 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 component placement and routing symmetrical can help to reduce thermal gradients.
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 high-quality input capacitor with low ESR to filter out noise and 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 operating conditions. As a general rule, the output capacitance should be limited to 10uF to 22uF to prevent oscillations and 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 issues in the converter, it is recommended to check the PCB layout for any potential issues such as poor grounding, inadequate decoupling, or excessive parasitic inductance. Additionally, the input and output voltage waveforms should be monitored using an oscilloscope to identify any signs of oscillation or instability. The component values and tolerances should also be verified to ensure that they are within the recommended specifications.
The recommended input voltage range for optimal performance is 36V to 72V, with a typical input voltage of 48V. Operating the device outside of this range may affect its performance, efficiency, and reliability.
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NCP10671BD060R2G Overview
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