NCP1124 NCP431 Universal AC Input, 5 Volt Output, 10 Watt Power Supply
■ This design note describes a simple 10 watt, universal AC input, constant output voltage power supply intended for AC adapters, industrial equipment, or white goods, where isolation from the AC mains is required, and low cost, high efficiency, and low standby power are essential.
■The featured power supply is a simple CCM flyback topology utilizing ON Semiconductor’s new NCP1124 monolithic with with integral 9-ohm, vertical channel MOSFET in a PDIP7 package (U1). This Design Note provides the complete circuit schematic details and BOM for 5V, 2A power supply. The simple input EMI filter (C1, L1) is adequate to pass Level B for FCC conducted EMI compliance. The NCP431 programmable zener is used as an error amplifier (U3), plus an optocoupler feedback scheme (U2) provides for excellent line and load regulation with high input-to-output safety isolation.
■Performance characteristics for efficiency, output ripple, and internal MOSFET drain switching characteristics (Vds, Id) are shown in the figures and plots below. Enhanced input transient protection (lightning, etc.) can be accomplished with the addition of an appropriate TVS device across the input of the diode bridge.Key
●Features:
■Universal AC input range (85 – 265 Vac).
■ Input filter for conducted EMI attenuation.
■650V Avalanche rated MOSFET.
■ Input filter for conducted EMI attenuation.
■Very low standby (no load) power consumption.
■Frequency foldback under light load.
■ Inherent over-current, over-voltage and over temperature protection.
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[ Smart Meters ][ Electric Meters ][ White Goods ] |
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Application note & Design Guide |
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Please see the document for details |
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PDIP7 |
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English Chinese Chinese and English Japanese |
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April 2014 |
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Rev. 0 |
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DN05064/D |
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595 KB |
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