Texas Instruments LM3448 Evaluation Board LM3448-EDSNEV/NOPB LM3448-EDSNEV/NOPB Scheda Tecnica
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LM3448-EDSNEV/NOPB
User's Guide
SNOA559B – October 2011 – Revised May 2013
AN-2127 LM3448 A19 Edison Retrofit Evaluation Board
1
Introduction
This demonstration board highlights the performance of a LM3448 non-isolated LED driver solution that
can be used to power a single LED string consisting of eight to twelve series connected LEDs from a 85
V
can be used to power a single LED string consisting of eight to twelve series connected LEDs from a 85
V
RMS
to 135 V
RMS
, 60 Hz input power supply.
This is a two-layer board using the bottom and top layer for component placement. The demonstration
board can be modified to adjust the LED forward current, the number of series connected LEDs that are
driven and the switching frequency. The topology used for this evaluation board eliminates the need for
passive power factor correction and results in high power factor with minimal component count which
results in a size that can fit in a standard A19 Edison socket. This board will also operate correctly and
dim smoothly using most standard TRIAC dimmers.
board can be modified to adjust the LED forward current, the number of series connected LEDs that are
driven and the switching frequency. The topology used for this evaluation board eliminates the need for
passive power factor correction and results in high power factor with minimal component count which
results in a size that can fit in a standard A19 Edison socket. This board will also operate correctly and
dim smoothly using most standard TRIAC dimmers.
Refer to the LM3448 Phase Dimmable Offline LED Driver with Integrated FET (
) data sheet for
detailed information regarding the LM3448 device. A schematic and layout have also been included along
with measured performance characteristics. A bill of materials is also included that describes the parts
used on this demonstration board.
with measured performance characteristics. A bill of materials is also included that describes the parts
used on this demonstration board.
2
Key Features
•
Drop-in compatibility with TRIAC dimmers
•
Line injection circuitry enables PFC values greater than 0.85
•
Adjustable LED current and switching frequency
•
Flicker free operation
3
Applications
•
Retrofit TRIAC Dimming
•
Solid State Lighting
•
Industrial and Commercial Lighting
•
Residential Lighting
4
Performance Specifications
Based on an LED V
f
= 3V
Symbol
Parameter
Min
Typ
Max
V
IN
Input voltage
85V
RMS
120V
RMS
135V
RMS
V
OUT
LED string voltage
-
36V
-
I
LED
LED string average current
-
181mA
-
P
OUT
Output power
-
6.5W
-
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1
SNOA559B – October 2011 – Revised May 2013
AN-2127 LM3448 A19 Edison Retrofit Evaluation Board
Copyright © 2011–2013, Texas Instruments Incorporated