Texas Instruments LM3444 A19 Edison Retrofit LED Driver (no dim) Evaluation Board LM3444-EDSNEV/NOPB LM3444-EDSNEV/NOPB Scheda Tecnica
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LM3444-EDSNEV/NOPB
User's Guide
SNVA455C – August 2010 – Revised May 2013
AN-2083 LM3444 A19 Edison Retrofit Evaluation Board
1
Introduction
The evaluation board included in this shipment converts 85V
AC
to 135V
AC
input and drives five to thirteen
series connected LED’s at the currents listed in
. This is a two-layer board using the bottom and
top layer for component placement. The board is surrounded by a larger area allowing for extra test points
and connectors for ease of evaluation. The actual board size is contained inside the larger outer area and
can be cut out for the smallest size possible. The evaluation board can be modified to adjust the LED
forward current and the number of series connected LEDs. The topology used for this evaluation board
eliminates the need for passive power factor correction and results in high efficiency and power factor with
minimal component count which results in a size that can fit in a standard A19 Edison socket. Output
current is regulated within ±15% of nominal from circuit to circuit and over line voltage variation. Refer to
the LM3444 AC-DC Offline LED Driver (
and connectors for ease of evaluation. The actual board size is contained inside the larger outer area and
can be cut out for the smallest size possible. The evaluation board can be modified to adjust the LED
forward current and the number of series connected LEDs. The topology used for this evaluation board
eliminates the need for passive power factor correction and results in high efficiency and power factor with
minimal component count which results in a size that can fit in a standard A19 Edison socket. Output
current is regulated within ±15% of nominal from circuit to circuit and over line voltage variation. Refer to
the LM3444 AC-DC Offline LED Driver (
) data sheet for details on the LM3444 IC.
A bill of materials below describes the parts used on this demonstration board. A schematic and layout
have also been included below along with measured performance characteristics including EMI/EMC data.
The above restrictions for the input voltage are valid only for the demonstration board as shipped with the
schematic below. The board is currently set up to drive five to thirteen series connected LEDs, but the
evaluation board may be modified to accept more series LEDs. Refer to the tables in this document for
modifying the board to accept more LEDs and/or adjust for different current levels.
have also been included below along with measured performance characteristics including EMI/EMC data.
The above restrictions for the input voltage are valid only for the demonstration board as shipped with the
schematic below. The board is currently set up to drive five to thirteen series connected LEDs, but the
evaluation board may be modified to accept more series LEDs. Refer to the tables in this document for
modifying the board to accept more LEDs and/or adjust for different current levels.
2
Evaluation Board Operating Conditions
V
IN
= 85V
AC
to 135V
AC
5 to 13 series connected LEDs as configured with the currents listed below
Can drive up to 18 series LEDs (see table)
I
LED
= 340 mA (5 LEDs)
I
LED
= 300 mA (7 LEDs)
I
LED
= 260 mA (9 LEDs)
I
LED
= 230 mA (11 LEDs)
I
LED
= 205 mA (13 LEDs)
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1
SNVA455C – August 2010 – Revised May 2013
AN-2083 LM3444 A19 Edison Retrofit Evaluation Board
Copyright © 2010–2013, Texas Instruments Incorporated