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LM3450 датащи(PDF) 1 Page - Texas Instruments

номер детали LM3450
подробное описание детали  LED Drivers with Active Power Factor Correction and Phase Dimming Decoder
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LM3450 датащи(HTML) 1 Page - Texas Instruments

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LM3450
www.ti.com
SNVS681C – NOVEMBER 2010 – REVISED JUNE 2011
LM3450, LM3450A
LED Drivers with Active Power Factor Correction and Phase Dimming Decoder
Check for Samples: LM3450
1
FEATURES
DESCRIPTION
The LM3450/50A is a power factor controller (PFC)
2
Critical Conduction Mode PFC
with separate phase dimming decoder. The PFC
Over-Voltage Protection
regulates
the
output
voltage
while
maintaining
Feedback Short Circuit Protection
excellent power factor. The phase dimming decoder
interprets the phase angle and remaps it to a 500Hz
70:1 PWM Decoded From Phase Dimmer
PWM output. This device is ideal for implementing a
Analog Dimming
dimmable off-line LED driver for 10-100W loads.
Programmable Dimming Range
The phase dimming decoder has several unique
Digital Angle and Dimmer Detection
features. The input-output mapping is programmable
Dynamic Holding Current
for design flexibility, while a dynamic filter and
variable
sampling
rate
provide
smooth
uniform
Smooth Dimming Transitions
dimming. A dynamic hold circuit ensures that the
Low Power Operation
phase dimmer angle is decoded properly while
Start-Up Pre-Regulator Bias
minimizing extra power loss.
Precision Voltage Reference
The LM3450A is identical to the LM3450 with the
exception of one circuit operation. The dynamic hold
APPLICATIONS
current
is
sampled
in
the
LM3450
while
it
continuously
operates
in
the
LM3450A.
This
Dimmable Downlights, Troffers, and Lowbays
difference between the two devices defines the
Large Form Factor Bulbs
suitable applications for each. The following is a
Indoor and Outdoor Area SSL
general guideline for choosing the correct device:
Power Supply PFC
Any 120V designs with POUT > 15W - LM3450A
Any 230V designs with POUT > 25W - LM3450A
120V 2-Stage designs with POUT < 15W - LM3450
230V 2-Stage designs with POUT < 25W - LM3450
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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