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AN3142 데이터시트(PDF) 20 Page - STMicroelectronics

부품명 AN3142
상세설명  Solution for designing a 400 W fixed-off-time controlled
PDF  44 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN3142 데이터시트(HTML) 20 Page - STMicroelectronics

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Designing a fixed-off-time PFC
AN3142
20/44
Doc ID 17005 Rev 3
4.3.7
L6563S biasing circuitry
Following the dimensioning of the power components, the biasing circuitry for the L6563S is
also described here. For reference, the internal schematic of the L6563S is represented
below in
Figure 11. For more detail on the internal functions please refer to the datasheet.
Figure 11.
L6563S internal schematic
Pin 1 (INV): This pin is connected both to the inverting input of the E/A and to the OVP
circuitry. A resistive divider is connected between the boost regulated output voltage and
this pin. The internal reference on the non-inverting input of the E/A is 2.5 V (typ.), the output
voltage (Vout) of the PFC pre-regulator is set at its nominal value, by the resistors ratio of
the feedback output divider. RoutH and RoutL are then selected considering the desired
nominal output voltage and the desired output power dissipated on the output divider. For
example for a 50 mW output divider dissipation:
Equation 39
With the commercial value selected RoutH = 3MΩ:
Equation 40
mW
50
)
V
5
.
2
V
(
R
2
OUT
outH
−
=
Ω
=
−
=
M
160
.
3
mW
50
)
V
5
.
2
V
400
(
R
2
outH
1
V
5
.
2
V
R
R
out
outL
outH
−
=
159
1
V
5
.
2
V
400
R
R
outL
outH
=
−
=



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