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AN628 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN628
Description  DESIGNING A HIGH POWER FACTOR SWITCHING
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN628 Datasheet(HTML) 16 Page - STMicroelectronics

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AN628 APPLICATION NOTE
16/35
where: Rfm is the programming current resistor.
K is a constant value = 0.1157 for R value in K
Ω and fSW in KHz.
A typical 20%
can be a good compromise.
Figure 18.
f
sw
∆
f
sw
-----------
Vl
0.8
1
0.4
0.2
0
0
45
90
135
Electrical degrees
180
0.8
1
0.4
0.2
0
fsw
+
-
1.28V
17
I
18
COSC
10I
-
+
200I
8.5V
1
1/VMRS
7
Ifm
16
FREQ-MOD
D94IN065A
ROSC
COSC
ROSC
Rfm
2 POLES
FILTER
VRMS
a)
b)
c)
Modulation Frequency Normalzed in an Half Cycle of the Mains Voltage



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