User manual

Q3
R28
R31
R32
R29
R30
Q1
R5
R7
Flyback PFC
C2
C3
VDC
SBIAS
C11
C5
R2
D1
R26
R6
R11
R3
L1
L4
C9
C30
R9
R56
R10
C21
V+
R23
R27
VREF
1
COMP
7
VAC
6
VADJ
2
FLT2
3
CS
11
FB
8
ZCD
14
VCC
13
ISEN
9
GATE
12
GND
10
DIM
5
FLT1
4
HOLD
15
BIAS
16
U1
C23
DIM
R24
C17
C22
R12R14
D10
C13
C4
9 8
2 1 3
.
5 4
.
7
6.
.
10
3010
40 40
T1
D5
C44
D8
D4
D9
C18
R25
C20
R33
F1
C7
D2
D3
D6
D7
C1
R36
RETURN
C43
C46
PBIAS
J1
R15
R34D17
D16
J3
C14
R21
R38
C24
R55
C26
C42
C31
C40
UVLO
1
CSN
7
PGATE
6
IADJ
2
EN
3
CSP
8
VCC
9
VIN
10
GND
5
COFF
4
U11
R84
D15
L3
EN
C38
R78
R83
R75
R73
C39
C36
Q7
VOUT
C10
R4
R13
EN
C37
C47
VDC
VOUT
R19
SDIM
Buck LED Driver
R1
Q2
D12
Sbias
O1bias
R58
Q6
D11
Sbias
O2bias
U10
R70
R77
R81 R72
C34
C35
1
2
5 4
3
6
U9
D14
1 2
5
4
3
6
U8
R71
SDIM
R69
DIM
R16
O1Pbias
R41
R43
R40
PBIAS
R42
COMP
FB
C25
VDC
O1bias
O2bias
Linear Regulators
Input Filter
Dimming
Compensation
Softstart
Q11
R45
R44
R17
D21
D13B
D13A
RETURN
J12
J10
J8
J14
J13
R48
R62
R49
C29
R22
BIAS
D22
R57
R39
R20
D20
C12
R59
R60
C28
R54
D23
EP
R18
Q8
D18
Pbias
O1Pbias
PBIAS
COMP
FB
V+
Q2
Q2 Q2
R66
R65
SGND
R46
R47
C66
PGND
VADJ
C8
R8
LINE
LED+
VADJ COMP PBIAS
BIAS
ZCD
ZCD
RETURN R63
R64
L2
R51
D24
D25
J2
LED-
NEUT
Q20
R61
VR1
Complete Evaluation Board Schematic www.ti.com
11 Complete Evaluation Board Schematic
Figure 25. Complete Evaluation Board Schematic
30
AN-2150 LM3450A Evaluation Board SNVA485B–June 2011–Revised May 2013
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