LM3444
www.ti.com
SNVS682C –NOVEMBER 2010–REVISED MAY 2013
LM3444 Design Example 1
Input = 90VAC to 135VAC, VLED = 7 x HB LED String Application at 400 mA
V
BUCK
V+
TP3
D3
TP4
LED+
BR1
+
R6
D9
C9
C7
D4
R8
D8
C10
C2
+
L4
L3
R7
V
LED
R4
C12
C15
C1
D10
TP5
LED-
V+
V
LED-
D12
Q3
R2
L5
TP14
Q1
D2
R10
L2
D1
C5
L1
ICOLL
RT1
F1
LM3444
U1
1
2
3
4
5
NC
NC 10
J1
NC
VCC
9
8
7
6
VAC
TP15
NC
GATE
ISNS
GND
Q2
TP16
COFF
FLTR2
R3
C4
C11
TP7-9
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