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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3372 датащи(PDF) 25 Page - STMicroelectronics |
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AN3372 датащи(HTML) 25 Page - STMicroelectronics |
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25 / 37 page  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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