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SSL21081AT Datasheet(PDF) 7 Page - NXP Semiconductors |
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SSL21081AT Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 22 page SSL21081AT All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 6 — 3 October 2013 7 of 21 NXP Semiconductors SSL21081AT Compact non-dimmable LED driver IC 8.2 Valley detection A new cycle is started when the primary switch is switched on (see Figure 4). Following time t1, when the peak current is detected on the SOURCE pin, the switch is turned off and the secondary stroke starts (3). When the secondary stroke is complete and the coil current at t3 equals zero, the drain voltage starts to oscillate around the VIN VOUT level. The amplitude equals VOUT. A special feature, called valley detection is an integrated part of the SSL21081AT circuitry. Dedicated built-in circuitry connected to the DRAIN pin, senses when the voltage on the drain of the switch has reached its lowest value. The next cycle is then started and as a result the capacitive switching losses are reduced. If both the frequency of the oscillations and the voltage swing are within the range specified (fring and ∆Vvrec(min)) for detection, a valley is detected and accepted. If a valid valley is not detected, the secondary stroke is continued until the maximum off-time (toff(high)) is reached. Then the next cycle is started. Fig 4. Buck waveforms and valley detection |
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