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L6563STR Datasheet(PDF) 29 Page - STMicroelectronics

Part No. L6563STR
Description  Enhanced transition-mode PFC controller
Download  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6563STR Datasheet(HTML) 29 Page - STMicroelectronics

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L6563S
Application information
Doc ID 16116 Rev 3
29/42
1.
Determine the input RMS voltage Vinclamp that produces Vo = Vox:
and choose a value Vinx such that Vin2 Vinx < Vinclamp. This will result in a limitation
of the output voltage range below Vox (it will equal Vox if one chooses Vinx = Vinclamp)
2.
Determine the divider ratio of the MULT pin (#3) bias:
and check that at minimum mains voltage Vin1 the peak voltage on pin 3 is greater than
0.65 V.
3.
Determine R1, the upper resistor of the output divider, for instance 3 M
Ω.
4.
Calculate the lower resistor R2 of the output divider and the adjustment resistor RT:
5.
Check that the maximum current sourced by the TBO pin (#6) does not exceed the
maximum specified (0.2 mA):
Figure 40
shows the internal block diagram of the tracking boost function.
Figure 40.
Tracking boost block
1
1
2
2
2
1
2
1
clamp
Vin
Vo
Vo
Vo
Vox
Vin
Vo
Vo
Vo
Vox
Vin
=
x
Vin
2
3
k
=
()
(
)
⎪⎪
=
=
1
2
1
2
T
1
2
2
1
1
2
Vo
Vo
Vin
Vin
1
R
k
2
R
Vin
5
.
2
Vo
Vin
5
.
2
Vo
Vin
Vin
1
R
5
.
2
2
R
3
T
max
TBO
10
2
.
0
R
3
I
=


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