LM3450 Datasheet, PDF (30/40 Pages) National Semiconductor (TI) – LED Driver with Active Power Factor Correction and Phase Dimming Decoder

LM3450
SNVS681D – NOVEMBER 2010 – REVISED MAY 2013
SINGLE STAGE LED DRIVER – LM3450A FLYBACK
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
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EMI
FILTER
L2
R2 C5
C4 ^C6
R6
C11
C13
R11
R12
V_REF
C10
V_ADJ
BIAS
HOLD
R8
C12
R9
PWM
FLT2
ZCD
FLT1
V_CC
LM3450A
DIM
GATE
V_AC
C14
R13
V_OP1
COMP
FB
CS
GND
I_SEN
R3
D6
Q1
T1
R4 _Thermal
Protect
R5
AUX
D7
D2 _AUX
D3
C9 D8
Q2
D1
V_OUT
C7
D5
C8
R26 R25
R14
LMV431
Q4
D12
R24
Q3
D11
D9
C15 _R15
HOLD
C16
RETURN
1.24V ^VOP2
V_OP1
V_OP1
R16
U1
OPTO1
D19
R22
CONTROL
FEEDBACK
V_OUT
R18
1.24V
R19
V_SDIM
LED
LOAD
R23
V_CC
R20 ^VOP2
DIMMING
OPTO2
PWM ^R21
R30
D13
R29 _VSDIM
C18 C19 R32
C17 R17
30
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