Design of CCFL backlight inverters
with frame & bar cores
 LCD
modules with backlighting lamps are widely used for Notebook PC's
and LCD monitors. The DC/AC backlight inverter plays a crucial role
in supplying the power for the lamp of these flat-panel displays.
This application note describes extensively the design steps for
CCFL backlight inverters, concentrating on the transformer. For
a worked-out example with frame & bar cores, it results in core
and winding design and thermal behaviour of the transformer. Additionally,
the whole inverter circuit is modelled and a survey is given of
core range and ferrite materials 3C90 and 3C91.
Date of release: January 2003
 435 kB
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This
4-page leaflet describes the Ferroxcube setup for measuring power
ferrites. It's based on many years of experience in our equipment
development and is now also offered on the market. The computer-controlled
setup can measure all relevant power ferrite parameters like saturation
flux density and other hysteresis loop parameters, power losses
and also small signal parameters like AL.
This
4 page product leaflet presents 2 new ER cores optimized for use
in planar converters. The advantages of these cores compared to
planar E cores are described and detailed product specs are included.
This
20 page application note describes the general principles of EMC
and the different ways ferrite components can be applied to improve
interference levels of electronic equipment. The different types
of suppression components are described and design hints are given.
This
4 page product leaflet presents the new mini drum core range and
provides information about the special high saturation ferrite material
3C92. Core shapes and ferrite are optimized for use in ultra low
profile small power applications.
In
compact step down converters, bobbin cores are often used as output
inductor. This 20 page application note describes how a reference
circuit has been modified in order to substitute a bobbin core by
a fully gapped IIC. The result is a more compact circuit with the
same performance. Design methods are explained in full detail, a
complete component list is provided.