Datasheet

ZCD
GATE
LM3450
V
CC
GND
COMP
FB
HOLD
V
AC
V
ADJ
CS
DIM
FLT2
FLT1
I
SEN
PWM
V
REF
BIAS
IADJ
EN
CSN
LM3409HV
UVLO
VCC
COFF
GND
CSP
PGATE
DAP
VIN
V
OUT
PWM
V
OP1
V
OP2
RETURN
RETURN
V
LED
LMV431
OPTO1
OPTO2
V
OP2
V
OP1
V
CC
V
OUT
EMI
FILTER
CONTROL
FEEDBACK
SECONDARY
LED DRIVER
DIMMING
VREF
+
-
AC
MAINS
LED
LOAD
Q1
Q2
D1
D2
D3
D5
C1
C2
C4
C5
C6
C7
C8
D7
D6
C9
D8
C10
C12
C13
C14
C15
D9
C16
L1
L2
T1
R1 R2
R3
R5
R6
R8
R9
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
C17
C18
C19
C21
C22
C20
D16
D13
D14
D15
D11D12
Q5
L4
Q3
Q4
R28
HOLD
V
LED
R27
D10
C11
L3
V
CC
V
ADJ
COMPBIAS
D18
D17
R7
Q6
R10
SOFTSTART
C3
D4
R4
AUX
AUX
LM3450
www.ti.com SNVS681D –NOVEMBER 2010–REVISED MAY 2013
Applications Information
See AN-2098 (literature number SNVA463) and/or AN-2150 (literature number SNVA485) for detailed design and
application information.
TWO STAGE LED DRIVER – LM3450 PRIMARY AND LM3409HV SECONDARY
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Product Folder Links: LM3450