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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SSL4120 датащи(PDF) 18 Page - NXP Semiconductors |
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SSL4120 датащи(HTML) 18 Page - NXP Semiconductors |
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18 / 48 page  SSL4120 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 2 — 1 November 2012 18 of 48 NXP Semiconductors SSL4120 Resonant power supply controller IC with PFC for LED lighting The valley sensing block connected to the SNSAUXPFC pin detects the valleys. This block measures the PFC transformer auxiliary winding voltage which is a reduced and inverted copy of the MOSFET drain voltage. When a valley of the drain voltage (= top at SNSAUXPFC voltage) is detected, the MOSFET is switched on. If a top is not detected on the SNSAUXPFC pin (a valley at the drain) within tto(vrec) =4 s after demagnetization is detected, the MOSFET is forced to switch on. 7.7.5 PFC frequency and off-time limiting The switching frequency is limited to fmax(PFC) for transformer optimization and to minimize switching losses. If the frequency for quasi-resonant operation > fmax(PFC), the system switches to DCM. The PFC MOSFET is switched on when the drain-source voltage is at a minimum (valley switching). The minimum off-time is limited at toff(PFC)min to ensure correct control of the PFC MOSFET under all circumstances. Fig 8. Demagnetization and valley detection demagnetized VRect/N VRect Vboost (Vboost - VRect)/N Vdemag(SNSAUXPFC) 0 0 magnetized Demagnetization lTr(PFC) Aux(PFC) Dr(PFC) GATEPFC Valley (= top for detection) 0 off on t 014aaa856 |
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