AND8318/D
R1
L2
750 uH
(total)
D1, 2, 3, 4
1N4007 x 4
L1, 1 mH
470uF
15, 2W
C1
25V x 3
AC input
+
N= 3:1
4.7nF
”x”
85 − 265Vac
R4
C4C
C4B
C4A
120
(optional
snubber)
Output
12V, 900mA
C5
C3
C2
D5
4.7uF,
400Vdc
x 2
0.1uF
50V
MUR440
F1
0.5A
C8
120pF
_
NCP1014
(SOT−223)
Z1 = 11V
(Vset)
U1
4
R2
39
1
2
3
U2
1
2
4
R3
390
C7
33uF
25V
C6
1nF
+
3
opto
Figure 2. Offline Buck with Tapped Inductor and Current Boosted Output
Mosfet Switch Current
Inductor
Current
C
B
A
Figure 3. Tapped Inductor Current Profile
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