Texas Instruments LM3445 Evaluation Boards LM3445-EDSNEV/NOPB LM3445-EDSNEV/NOPB Scheda Tecnica
Codici prodotto
LM3445-EDSNEV/NOPB
User's Guide
SNVA442C – June 2010 – Revised May 2013
AN-2061 LM3445 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 the Evaluation Board Operating Conditions section. 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. This board also operates correctly and dims smoothly using most standard
triac dimmers. Output current is regulated within ±15% of nominal from circuit to circuit and over line
voltage variation. For details on the LM3445 IC, see the LM3445 Triac Dimmable Offline LED Driver Data
Sheet (
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. This board also operates correctly and dims smoothly using most standard
triac dimmers. Output current is regulated within ±15% of nominal from circuit to circuit and over line
voltage variation. For details on the LM3445 IC, see the LM3445 Triac Dimmable Offline LED Driver Data
Sheet (
A bill of materials shown in
describes the parts used on this demonstration board. A schematic
and layout have also been included 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. for detailed information regarding the LM3445 device, see the LM3445 Triac
Dimmable Offline LED Driver Data Sheet (
data. The above restrictions for the input voltage are valid only for the demonstration board as shipped
with the schematic below. for detailed information regarding the LM3445 device, see the LM3445 Triac
Dimmable Offline LED Driver Data Sheet (
). 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 to modify the board to accept more LEDs and/or adjust for different current
levels.
the tables in this document to modify the board to accept more LEDs and/or adjust for different current
levels.
2
Evalution 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)
All trademarks are the property of their respective owners.
1
SNVA442C – June 2010 – Revised May 2013
AN-2061 LM3445 A19 Edison Retrofit Evaluation Board
Copyright © 2010–2013, Texas Instruments Incorporated