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SSL2101 데이터시트(PDF) 8 Page - NXP Semiconductors |
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SSL2101 데이터시트(HTML) 8 Page - NXP Semiconductors |
8 / 23 page SSL2101 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 4.1 — 5 December 2011 8 of 23 NXP Semiconductors SSL2101 Dimmable Greenchip driver for LED lighting As soon as the oscillator voltage is high again and the secondary stroke has ended, the circuit waits for a low drain voltage before starting a new primary stroke. Figure 6 shows the drain voltage together with the valley signal, the signal indicating the secondary stroke and the RC voltage. The primary stroke starts some time before the actual valley at low ringing frequencies, and some time after the actual valley at high ringing frequencies. Figure 7 shows a typical curve for a reflected output voltage N at an output voltage of 80 V. This voltage is the output voltage transferred to the primary side of the transformer with the factor N (determined by the turns ratio of the transformer). It shows that the system switches exactly at minimum drain voltage for ringing frequencies of 480 kHz, thus reducing the switch-on losses to a minimum. At 200 kHz, the next primary stroke is started at 33 before the valley. The switch-on losses are still reduced significantly. A: Start of new cycle with valley switching. B: Start of new cycle in a classical PWM system. Fig 6. Signals for valley switching, flyback configuration 014aaa572 drain valley secondary ringing secondary stroke primary stroke secondary stroke RC oscillator regulation level A B |
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