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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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L6599ATD Fiches technique(PDF) 17 Page - STMicroelectronics |
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L6599ATD Fiches technique(HTML) 17 Page - STMicroelectronics |
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17 / 32 page  DocID15534 Rev 7 17/32 L6599AT 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 L6599AT 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 L6599AT 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 L6599AT can switch off a PFC controller at light load |
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