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AN3027 Scheda tecnica(PDF) 3 Page - STMicroelectronics

Il numero della parte AN3027
Spiegazioni elettronici  How to design a transition-mode PFC pre-regulator
PDF  41 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3027 Scheda tecnica(HTML) 3 Page - STMicroelectronics

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AN3027
List of figures
Doc ID 16134 Rev 4
3/41
List of figures
Figure 1.
Typical system block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2.
Boost converter circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3.
Inductor current waveform and MOSFET timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4.
Switching frequency, fixing the line voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 5.
θ1 and θ2 dependence on input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 6.
Capacitive losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 7.
Conduction losses and total losses in the STF7NM50N MOSFET for the L6563S TM
PFC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 8.
L6563S internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 9.
Open loop tran. function bode plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 10.
Phase function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 11.
Multiplier characteristics family for VFF = 1 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 12.
Multiplier characteristics family for VFF = 3 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 13.
Mains detector and discharge resistor allow fast response to sudden line drops not
depending on the external RC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 14.
Brownout function in L6563S and L6563H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 15.
Optimum MOSFET turn-on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 16.
Tracking boost block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17.
L6563H - SO16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 18.
L6563S - SO14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 19.
High-voltage startup generator: internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 20.
Timing diagram: normal power-up and power-down sequences . . . . . . . . . . . . . . . . . . . . 32
Figure 21.
High-voltage startup behavior during latch-off protection . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 22.
High-voltage startup, managing the DC-DC output short-circuit. . . . . . . . . . . . . . . . . . . . . 33
Figure 23.
Excel spreadsheet design specification input table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 24.
Other design data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 25.
TM PFC using the L6563S Excel spreadsheet schematic . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 26.
TM PFC using the L6563H Excel spreadsheet schematic . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 27.
Excel spreadsheet BOM - 100 W TM PFC based on L6563S/H . . . . . . . . . . . . . . . . . . . . 36
Figure 28.
Wide-range 100 W demonstration board electrical circuit (EVL6564-100W) . . . . . . . . . . . 37
Figure 29.
Wide-range 100 W demonstration board electrical circuit (EVL6563H-100W) . . . . . . . . . . 38



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