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Semiconductor Components Industries, LLC, 2013
July, 2013 − Rev. 2
1 Publication Order Number:
EVBUM2075/D
NCP1337ADAPGEVB
60W Adapter
Documentation Package
Evaluation Board User's
Manual
Overview
This reference document describes a built-and-tested,
GreenPoint
solution for a 60 W power adapter.
The reference design circuit consists of one single-sided
100 mm 52 mm printed circuit board. Height is 25 mm.
An overview of the entire circuit is provided by Figure 1.
As shown in that figure, ON Semiconductor devices are
available for every block of adapter; and by judicious choice
of design tradeoffs, optimum performance is achieved at
minimum cost.
Figure 1. Circuit Schematic
Introduction
This design using NCP1337 offers a perfect solution for
portable DVD, LCD TV, or monitor and notebook adapter
applications. This adapter provides effective protection
functions such as over-load protection, over-voltage
protection, shortcircuit protection and brown-out
protection. Thanks to the quasi-resonant operation and
synchronous rectifier, this adapter has high efficiency and
improved EMI performance. The standby consumption is
lower because of the cycle skipping and soft ripple mode.
Regulatory requirements addressing low standby power
consumption and efficiency in active mode for external
power supply (EPS) add extra constraints in the design of the
adapter.
These requirements target two issues:
Get rid of the losses in a no load situation (e.g., when
the notebook adapter is plugged in, even when it is not
connected to the computer).
Achieve a good average efficiency during various active
mode load conditions (25%, 50%, 75% and 100%).
Many regulations have been proposed around the word.
Hereafter is the list of some of the most important ones:
http://onsemi.com
EVAL BOARD USER’S MANUAL
Verzeichnis
