L4981A - L4981B
Figure 9B:
L4981B Power Factor Corrector (200W)
T
R22
C7
R14
R7
C8
D3
C5
C9
R6
C12
R15
D4
R1
R9
D1
+
Vo=400V
FUSE
Vi
BRIDGE
R8
7
4
1
19
13
R12
14
3
C11
D2
C2
85VAC-265VAC
15
C1
L4981B
16
20
6
2
8
5
R21
R5
R11
R3
RS
C3
R4
C4
R16
C6
9
18
10
17
12 11
R13
MOS
D5
R17
R2
R10
C10
-
D95IN220
PART LIST
R
S
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R21
R22
0.07(3 x .22)
820kΩ
10kΩ
1.8kΩ
1.8kΩ
18k
Ω
1.2M
Ω
360kΩ
33kΩ
1.8MΩ
21k
Ω
402
Ω
120kΩ
27Ω
1MΩ
120kΩ
24k
Ω
1.8k
Ω
5.1kΩ
1/2W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/4W
1/2W
1/4W
4W
1/4W
5%
1%
1%
5%
5%
5%
5%
5%
5%
1%
1%
1%
5%
5%
1%
5%
5%
1%
1%
1%
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
D1
D2, D3
D4
D5
MOS
470nF
100µF
2.2nF
1.1nF
100µF
1µF
220nF
220nF
330nF
1
µ
F
270pF
8.2nF
STTA506D
1N4148
18V
BYT11-600
STH/STW15NA50
FUSE = 4A/250V
1/2W
16V
400V
100V
25V
16V
63V
63V
400V
450V
1.1MΩ
1/4W
BRIDGE = 4 x P600M
T= primary: 88 turns of 12 x 32 AWG (0.2mm)
secondary: 9 turns of # 27AWG (0.15mm)
core: B1ET3411A THOMSON - CSF
gap: 1,6mm for a total primary inductance of
0.9mH
f
SW
= 80 to 92kHz P
O
= 200W
V
OUT
= 400V I
rms max
= 2.53A
V
OVP
= 442V I
PK max
= 6.2A
9/17
STMICROELECTRONICS [ STMICROELECTRONICS ]
