Description:Constant Current Primary-side feedback eliminates secondary controller; ±10% Current Regulation; 560-V Startup Current Source; 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; Cycle by Cycle peak current limit; Build-in soft-sart; Wide Operation VCC range (up to 28 V); Low Start-up current (2.5 μA typ.); Clamped Gate-drive Output for Mosfet; CS & Vs/ZCD pin Short and Open Protec
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 airflow around the device. A 4-layer PCB with a solid ground plane and a thermal relief pattern around the thermal pad is also recommended.
To ensure reliable start-up of the converter, make sure to follow the recommended start-up sequence, provide a stable input voltage, and ensure that the input voltage is within the specified range. Also, ensure that the output capacitor is properly sized and has a low ESR to prevent voltage overshoot during start-up.
The maximum allowed output capacitance for the NCP1365BABCYDR2G is 220uF. Exceeding this value may cause instability or oscillation in the converter.
The maximum output current capability of the device can be calculated based on the input voltage, output voltage, and the device's efficiency. The datasheet provides a formula to calculate the maximum output current, which is Iout_max = (Vin * η) / (Rds(on) * (Vin - Vout)).
The recommended input capacitor type is a ceramic capacitor with a value of 10uF to 22uF, and a voltage rating of at least 1.5 times the maximum input voltage. A low-ESR capacitor is recommended to minimize input voltage ripple and ensure stable operation.
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NCP1365BABCYDR2G Overview
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