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AN4539 bảng dữ liệu(PDF) 28 Page - STMicroelectronics

tên linh kiện AN4539
Giải thích chi tiết về linh kiện  HRTIM cookbook
PDF  33 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN4539 bảng dữ liệu(HTML) 28 Page - STMicroelectronics

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Transition mode power factor controller
AN4539
28/33
DocID026506 Rev 1
Figure 15 and Figure 16 show the waveforms during the various operating mode, with the
following parameters defined:
•
Ton min: during this period, spurious over-currents are discarded (typically these are
freewheeling diode recovery currents). It is represented as OC blanking and
programmed with CMP3;
•
Ton max: practically, the converter set-point. It is defined with CMP1;
•
Toff min: limits the frequency when current limit is close to zero (demagnetization is very
fast). It is defined with CMP2 in auto-delayed mode;
•
Toff max: prevents the system to be stuck if no ZCD occurs. It is defined with CMP4 in
auto-delayed mode.
Figure 15. Transition mode PFC operation at Ton max and during over-current



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