Description:Built−in 700 V MOSFET with RDS(on) of 11.4 Ω; Large Creepage Distance Between High−voltage Pins; Adjustable Peak Current up to 650 mA; Direct Feedback connection for non-isolated converter; Internal and Adjustable Over Power Protection (OPP) Circuit; Auto-Recovery Output Short Circuit Protection with Timer-Based Detection; Frequency Jittering (including during frequency foldback mode); Current−Mode Fixed Frequency Operation – 60 or 100 kHz (130 kHz on demand); Frequency Foldback Operation; AC Input Voltage
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 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 operating conditions. As a general rule, the output capacitance should be limited to 10-20 times the output inductance to prevent oscillations. In the case of the NCP1063AP060G, the recommended output capacitance is 10-22uF.
To optimize the design for low EMI emissions, it is recommended to use a shielded inductor, keep the layout compact and symmetrical, and use a common-mode choke to filter out common-mode noise. Additionally, the use of a snubber network can help to reduce radiated emissions.
The recommended input filter configuration for reducing input ripple current involves using a pi-filter (L-C-L) or a T-filter (L-C-R-L) with a suitable inductor and capacitor values. The filter should be designed to attenuate the input ripple current to a level that is acceptable for the specific application.
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NCP1063AP060G Overview
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