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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VIPER22ADIP датащи(PDF) 10 Page - STMicroelectronics |
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VIPER22ADIP датащи(HTML) 10 Page - STMicroelectronics |
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10 / 15 page  VIPer22ADIP / VIPer22AS 10/15 the regulation point where the secondary loop begins to send a current in the optocoupler. At this point, the converter enters a regulated operation where the FB pin receives the amount of current needed to deliver the right power on secondary side. This sequence is shown in figure 11. Note that during the real starting phase tss, the device consumes some energy from the VDD capacitor, waiting for the auxiliary winding to provide a continuous supply. If the value of this capacitor is too low, the start up phase is terminated before receiving any energy from the auxiliary winding and the converter never starts up. This is illustrated also in the same figure in dashed lines. OVERVOLTAGE THRESHOLD An overvoltage detector on the VDD pin allows the VIPer22A to reset itself when VDD exceeds VDDovp. This is illustrated in figure 12, which shows the whole sequence of an overvoltage event. Note that this event is only latched for the time needed by VDD to reach VDDoff, and then the device resumes normal operation automatically. Figure 11 : Start Up Sequence t t IFB VDDon t VOUT VDD VDDoff tss Figure 12 : Overvoltage Sequence t t VDS VDDon VDD VDDoff VDDovp |
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