LM3450 datasheet(1/28 Pages) NSC

Part #	LM3450

Description	LED Driver with Active Power Factor Correction and Phase Dimming Decoder

PDF	28 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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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

301274

www.national.com

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

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