Onsemi NCP1063AP06 | Demoboard DN05081/D

Description

This design note describes a simple 4.2 watt, universal AC input, Non-isolated buck converter for industrial equipment, or white goods where non-isolation from the AC mains is required, and simple, low cost, high efficiency, and low standby power are essential.The featured power supply is a simple non-isolated buck topology utilizing ON Semiconductor’s new NCP1063 monolithic switcher with integrated 11.4 ohm MOSFET in a DIP7 package (U1). This Design Note provides the complete circuit schematic details and BOM for 12 volt, 0.35 amp power supply. This design also reserves a 5 volt output and a MC7805CT (U2) can be used for this output. 5V output maximum current is set by MC7805CT (U2) thermal performance and total system current; total current of 5 V and 12 V cannot exceed total system output current.This design used half-wave rectifier and a common neutral for input and output, so it is very useful in some white goods application.Rectifier, filter and EMC circuit formed by D1, C2, C3, L1, DNR1 is varistor to provide inrush protection, buck switching component formed by U1, D2, L2, C6 and C8. D2, C7 formed boost circuit to boost output voltage to switcher as Vcc and feedback, R3 and R4 is resistor divider of feedback network, C4 is feedback compensation capacitor, R2 is used to set maximum peak current, R1 is dummy load and used to decrease high output voltage at no load. R1 can be also replaced by a 15V zener in order to reduce standby power

Features

Universal AC input range (90 – 264 Vac). Input filter for conducted EMI attenuation.Very low standby (no load) power consumption.Frequency foldback improves efficiency at light load Inherent over-current, over-voltage and over temperature protection.Frequency Jittering for Better EMI Signature.Adjustable peak current improves OCP performance.

Typical applications

• White Goods Industry

More information

• Datasheet