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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) 15 Page - STMicroelectronics |
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AN3329 датащи(HTML) 15 Page - STMicroelectronics |
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15 / 47 page  AN3329 Functional check Doc ID 18376 Rev 1 15/47 Figure 19 and Figure 20 illustrate the waveforms during light load operation. Viper27LN operates in burst-mode, with just a few pulses per burst, minimizing switching losses and therefore improving efficiency under light load operation, making it suitable for equipment with low standby consumption requirements. Figure 21 shows the OVP response, observed opening the Viper27LN feedback loop. If the output voltage value exceeds the internal threshold set by the resistor divider connected to the CONT pin (#3), the Viper27LN stops working, providing protection against dangerous voltages which may damage the system. It remains latched until the VDD has dropped down to VDD_RESTART (4.5 V). At this point the auto-restart process takes place like any startup; the internal current source charges the VDD capacitor until it reaches the VDDon threshold Figure 19. Standby supply burst mode operation at 230 Vac - 50 Hz - 10 mA load Figure 20. Standby supply burst mode operation at 230 Vac - 50 Hz - 10 mA load-detail CH1: DRAIN (pin #8) CH2: VDD (pin #2) CH3: +5 V standby CH4: FB (pin #4) CH1: DRAIN (pin #8) CH2: VDD (pin #2) CH3: +5 V standby CH4: FB (pin #4) Figure 21. Standby supply OVP at 115 Vac - 60 Hz, full load Figure 22. Standby supply OVP at 230 Vac - 50 Hz - 0.5 A CH1: DRAIN (pin #8) CH2: +5 V standby CH3: CONT (pin #3) CH4: FB (pin #4) CH1: DRAIN (pin #8) CH2: VDD (pin #2) CH3: +5 V standby |
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