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低压降稳压单白光LED驱动器-TPS7510X,提供了超乎想

消耗积分:5 | 格式:rar | 大小:344 | 2010-03-18

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低压降稳压单白光LED驱动器-TPS7510X,提供了超乎想象的小型解决方案尺寸:Analog Applications Journal
LDO white-LED driver TPS7510x provides
incredibly small solution size
Introduction
Use of white-LED drivers has increased in
recent years due to the popularity of color
LCD screens on most portable electronic
equipment. The white backlight required to
bring out the color in these screens is most
often provided by white LEDs. In applications
powered by a one-cell Li-ion battery,
charge pumps or boost converters have been
required to drive these LEDs because of
their high forward voltage (4 V typical). As
white-LED technology has advanced, the
forward voltage required has significantly
dropped. Today, white LEDs such as Nichia’s
NHSW046 or NSSW100C are available with
a typical forward voltage of less than 3 V.
The lower forward voltage eliminates the
need for voltage boosting, permitting the
use of linear regulation topologies that
reduce costs and solution size and increase
efficiency across the battery-discharge range. Figure 1
compares the efficiency and battery voltage of the Texas
Instruments TPS7510x and a typical series LED boost converter.
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