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AN3027 bảng dữ liệu(PDF) 18 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  How to design a transition-mode PFC pre-regulator
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN3027 bảng dữ liệu(HTML) 18 Page - STMicroelectronics

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Designing a TM PFC
AN3027
18/41
Doc ID 16134 Rev 4
From
(12) and Equation 35 the maximum thermal resistance to keep the junction
temperature below 125 °C is:
Equation 36
Because the calculated Rth is lower than the STTH2L06 thermal resistance junction-
ambient, a heatsink is not needed to properly dissipate the heat.
3.4
L6563S biasing circuitry
In this section we describe the dimensioning of the power components as well as the biasing
circuitry for the L6563S. For reference, the internal schematic of the L6563S is represented
below in
Figure 8. For more details on the internal functions please refer to the datasheet.
Figure 8.
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 has to be connected between the boost regulated output voltage
and this pin. The internal reference on the E/A non-inverting input is 2.5 V (typ.). The PFC
output voltage (Vout) is set at its nominal value by the resistor ratio of the feedback output
divider. RoutH and RoutL are then selected considering the nominal output voltage (4) and
diode
ambx
th
P
T
C
125
R
−
°
=
W
C
68
.
284
W
26
.
0
C
50
C
125
R
th
°
=
°
−
°
=



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