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AN3372 bảng dữ liệu(PDF) 25 Page - STMicroelectronics

tên linh kiện AN3372
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AN3372 bảng dữ liệu(HTML) 25 Page - STMicroelectronics

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AN3372
ST7 microcontroller application pin use
Doc ID 018625 Rev 1
25/37
Figure 18.
PFC ZCD circuitry
The boost converter of the PFC works in transition mode. To obtain this feature an auxiliary
winding is wound in the main inductor of the half bridge and when the current reaches the
zero value the variation of voltage used by the LTIC pin of the microcontroller starts the
conduction of the switch.
●
Pin 27: general purpose input-output pin. This pin is used to switch on a red LED
indicating fault condition.
●
Pin 28: PFC OC, this pin is used to perform overcurrent on the PFC section avoiding
saturation of the inductor. In Figure 18 it is possible to see that an RC filter composed
of R3 and C5 is inserted to avoid unexpected switch-off due to the noise in the circuit.
This protection is not implemented.



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