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AN4213 Datasheet(PDF) 21 Page - STMicroelectronics

Part # AN4213
Description  Fluorescent lamps are increasingly driven by electronic
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4213 Datasheet(HTML) 21 Page - STMicroelectronics

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DocID023984 Rev 2
21/42
AN4213
Designing a TM PFC
where V
ZCDH
= 5.7 V (typ) and V
ZCDL
= 0 (typ) are given in the datasheet. We consider the
highest value, for this reason the selected limiting resistor is R
ZCD
= 47 k
Ω. The complete
boost PFC schematic is given in the following figure.
Figure 11. Boost PFC section
AM17325v1
AC
INV
1
COMP
2
3
MULT
4
CS
ZCD
GND
GD
VCC
5
6
7
8
+
400Vdc
Fuse
C1
L1
C20
D1
D2
D3
D4
C3
R25
R26
R2
R17
R18
L2
R20
R5
R4
R9
D5
NTC
C7
R16
R7
R22
C6
C19
R27
C23
+
D12
C24
C25



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