Description:No frequency clamp, 80 or 110 kHz Maximum Switching Frequency; Quasi-Resonant with Valley Switching Operation; Fixed Peak Current & Deep frequency foldback @ light load operation; Wide Operation VCC range (up to 28 V); Cycle by Cycle peak current limit; CS & Vs/ZCD pin Short and Open Protection; Internal Temperature Shutdown; Constant Current Primary-side feedback eliminates secondary controller; ±10% Current Regulation; Clamped Gate-drive Output for Mosfet; Built-in soft-start; Low Start-up current ( 2 μA
The recommended PCB layout for optimal thermal performance involves placing the device on a thermal pad connected to a large copper area on the PCB, and ensuring good thermal conduction to the surrounding air. A minimum of 2oz copper thickness is recommended. Refer to the onsemi application note AND9233/D for more details.
To ensure reliable start-up, it is recommended to add a soft-start circuit to limit the inrush current during start-up. Additionally, ensure that the input voltage is within the specified range, and the output capacitor is properly sized to handle the output voltage ripple.
The maximum allowed output capacitance for stable operation is dependent on the output voltage and the ESR of the capacitor. As a general guideline, the output capacitance should be limited to 100uF or less for 5V output, and 47uF or less for 3.3V output. Refer to the onsemi application note AND9233/D for more details.
To troubleshoot oscillations or instability in the converter, check for proper PCB layout, ensure that the input and output capacitors are properly sized and placed, and verify that the feedback loop is properly compensated. Also, check for any noise or interference on the input or output lines that may be causing the instability.
The recommended input capacitor type is a low-ESR ceramic capacitor, such as X5R or X7R, with a value of 10uF to 22uF. The input capacitor should be placed as close as possible to the VIN pin of the NCP1361EABAYSNT1G.
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