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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3329 датащи(PDF) 16 Page - STMicroelectronics |
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AN3329 датащи(HTML) 16 Page - STMicroelectronics |
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16 / 47 page  Functional check AN3329 16/47 Doc ID 18376 Rev 1 and switching starts again. This protection and restart sequence lasts as long as the OVP condition is removed. It is important to highlight that the Viper27LN OVP protection, thanks to the internal logic, ensures a stable OVP intervention point, independent of the output load, even if the voltage sensing is done on auxiliary winding at primary side. It can be noted, by comparing Figure 21 to Figure 23 which report some OVP intervention with different loads and input voltage conditions, that the maximum output voltage peak has a negligible variation. Figure 24 shows, in detail, the OVP intervention at 115 Vac. In Figure 25 a short-circuit event on the standby supply output has been captured. In this situation the Viper27LN enters a safe hiccup mode, providing protection against overheating of the auxiliary converter power components. Figure 23. Standby supply OVP at 115 Vac - 60 Hz - PFC on - 1 A Figure 24. Standby supply OVP at 115 Vac - 60 Hz - PFC on - 1 A CH1: DRAIN (pin #8) CH2: +5 V standby CH3: CONT (pin #3) CH4: FB (pin #4) CH1: DRAIN (pin #8) CH2: 5 V standby CH3: CONT (pin #3) CH4: FB (pin #4) Figure 25. Standby supply output short-circuit at 230 Vac - 50 Hz, full load Figure 26. Standby supply output short-circuit at 230 Vac - 50 Hz, full load - detail CH1: DRAIN (pin #8) CH2: +5 V standby CH3: VDD (pin #2) CH4: FB (pin #4) CH1: DRAIN (pin #8) CH2: 5 V standby CH3: VDD (pin #2) CH4: FB (pin #4) |
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