Very low standby power adapter circuit design

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Overview:
Power adapter is a power supply conversion device for small portable electronic devices and electronic appliances. It is generally composed of a casing, a power transformer and a rectifier circuit. It can be divided into an AC output type and a DC output type according to its output type; Divided into wall-mounted and desktop. Widely used in telephone sub-machines, game consoles, language repeaters, walkmans, laptops, cellular phones and other equipment.

For example, the US Environmental Protection Agency (EPA) version 2.0 "Energy Star" External Power Supply Specification (EPA 2.0) further enhances energy efficiency requirements based on version 1.1 (see Table 1), where Ln is the natural logarithm of the rated output power.

Table 1: Specification for the 1.1 and 2.0 versions of the US Environmental Protection Agency's "Energy Star" external power supply.

The power levels of different adapters vary widely, and power supplies with power greater than 75 W require increased power factor correction (PFC) according to IEC61000-3-2 and other requirements, and less than 75 W. This article focuses on the features required for power sub-75 W adapters to meet the new EPA 2.0 specifications, as well as ON Semiconductor's high-performance, energy-efficient controllers that provide these required features.
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