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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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L6599AFD Scheda tecnica(PDF) 17 Page - STMicroelectronics |
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L6599AFD Scheda tecnica(HTML) 17 Page - STMicroelectronics |
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17 / 32 page  DocID028175 Rev 3 17/32 L6599AF Application information 32 eliminating the no load consumption of this stage (0.51 W). There is no compliance issue in that, because EMC regulations on low-frequency harmonic emissions refer to nominal load, no limit is envisaged when the converter operates with light or no load. To do so, the L6599AF provides pin 9 (PFC_STOP): it is an open collector output, normally open, that is asserted low when the IC is idle during burst mode operation. This signal is externally used for switching off the PFC controller and the pre-regulator, as shown in Figure 9. When the L6599AF is in UVLO, the pin is kept open to let the PFC controller start first. Figure 8. Load-dependent operating modes: timing diagram Figure 9. How the L6599AF can switch off a PFC controller at light load |
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