Datasheet

R20 C18
FLTR2
R3
R8
DIM
R16
C16
R2
R7
D5
Q1
R11
V+
C14
C15
V
CC
R13
D9
R22
R21
VLED+
VLED±
L1
C6
R6
V+
LINE
NEUTRAL
INPUT EMI FILTER AND RECTIFIER CIRCUIT
D1
D3
D4
D6
C12
DIM
V
CC
FLTR2
R18
C17
R17
TRIAC HOLDING
CIRCUIT
R23
C20
Q4
C2
C5
L2
R4
R12
C8
R5
D2
T1
C1
+
LM3448
9
10
11
12
13 4
5
6
7
8
BLDR
ASNS
ISNS
DIM
COFF
GND
VCC
FLTR1
GND
FLTR2
14
3NC
NC
15 2SWSW
16 1
SW
SW
COFF
COFF
R9
C7
COFF CURRENT
SOURCE
V
CC
V
AUX
R14
V
AUX
C11
Q3
OVP CIRCUIT
FLTR2
D11
V
AUX
Q2
VCC AUXILIARY BIAS CIRCUIT
R15
D10
D8
V
CC
VR1
F1
C9 C10
R10
C4
R1
C3
PGND SGND
D7
C13
www.ti.com Evaluation Board Schematic
14 Evaluation Board Schematic
WARNING
The LM3448 evaluation board has exposed high voltage
components that present a shock hazard. Caution must be taken
when handling the evaluation board. Avoid touching the evaluation
board and removing any cables while the evaluation board is
operating. Isolating the evaluation board rather than the
oscilloscope is highly recommended.
29
SNOA555C–April 2011–Revised May 2013 AN-2091 LM3448 - 230VAC, 6W Isolated Flyback LED Driver
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