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LM3450 датащи(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM3450
подробное описание детали  LED Driver with Active Power Factor Correction and Phase Dimming Decoder
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
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LM3450 датащи(HTML) 1 Page - National Semiconductor (TI)

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LM3450
November 18, 2010
LED Driver with Active Power Factor Correction and Phase
Dimming Decoder
General Description
The LM3450 is a power factor controller (PFC) with separate
phase dimming decoder. The PFC regulates an accurate out-
put 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 dy-
namic hold circuit ensures that the phase dimmer angle is
decoded properly while minimizing the extra power losses
associated with holding current.
Features
Critical conduction mode PFC
Over-voltage protection
Feedback short circuit protection
70:1 PWM decoded from phase dimmer
Analog dimming
Programmable dimming range
Digital angle and dimmer detection
Dynamic holding current
Smooth dimming transitions
Low power operation
Start-up pre-regulator bias
Precision voltage reference
Applications
Dimmable downlights, troffers, and lowbays
Indoor and outdoor area SSL
Power supply PFC
Typical Application
30127401
© 2010 National Semiconductor Corporation
301274
www.national.com


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