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美国国家半导体公司LM3450 LED调光驱动器
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General Description
The LM3450 is a power factor controller (PFC) with separate
phase dimming decoder. The PFC regulates an accurate output
voltage while maintaining excellent power factor at the
input. The phase dimming decoder interprets the phase angle
and remaps it to a 500Hz PWM output. This combination of
features is ideal for implementing a dimmable off-line LED
driver for 10-100W loads.
The phase dimming decoder has several unique features. A
programmable mapping from input to output increases design
flexibility, while a dynamic filter and variable sampling rate
provide a fast, smooth response to dimmer movement. A dynamic
hold circuit ensures that the phase dimmer angle is
decoded properly while minimizing the extra power losses
associated with holding current.
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