LM3450 Datasheet, PDF (27/40 Pages) National Semiconductor (TI) – LED Driver with Active Power Factor Correction and Phase Dimming Decoder

LM3450
www.ti.com
Applications Information
SNVS681D – NOVEMBER 2010 – REVISED MAY 2013
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
SOFTSTART
BIAS COMP
V_ADJ V_CC
D4
R7
D18
Q6
C3 D17
R10
AC
MAINS
R27 L1
R1
C2
D10
R28 ^L3
C1 ^RETURN
EMI
FILTER
L2
R2 C5
C4 ^C6
V_REF
R3
BIAS
D6
Q1
R6
C10
C11
R8
V_ADJ
FLT2
HOLD
ZCD
D7
R4
R5
D2 _AUX
AUX
C12
D3
R9
FLT1
V_CC
C13
LM3450
C9 D8
Q2
PWM
DIM
GATE
R11
V_AC
R12
COMP
C14
R13
FB
V_{OP1 CONTROL}
R16 ^FEEDBACK
CS
GND
I_SEN
R14
D9
C15 _R15
HOLD
C16
V_OUT
RETURN
OPTO1
R17
C17
C18
R18
D13
LMV431
R19
D14
UVLO
C19
IADJ
VIN
VCC
D1
V_OUT
T1
C7
D5
C8
R25
Q4
D12
R24
Q3
D11
V_OP2
V_OP1
C20
C21
V_{CC DIMMING}
R20 ^VOP2
OPTO2
EN
LM3409HV CSP
COFF
R22
V_LED
C22
GND
DAP
CSN
PGATE
R23
Q5
L4
V_LED
PWM
R21 D15
SECONDARY
LED DRIVER
D16
LED
LOAD
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