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SSL21151T 데이터시트(PDF) 6 Page - NXP Semiconductors |
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SSL21151T 데이터시트(HTML) 6 Page - NXP Semiconductors |
6 / 15 page SSL2115X All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 2 — 7 June 2012 6 of 15 NXP Semiconductors SSL2115X Low-cost non-dimmable LED driver IC limits the VLED when VCC reaches the Vprot(VCC) value. A non-latched application can be created depending on implementation of a small preload. Without the small preload, the protection latches. 8.11 Operational limits The application must stay in Current Control Mode (CCM) for normal functionality. During normal operation, the switching frequency can reach 0.85 f sw(high). This requirement must be met for the highest specified LED voltage. On the other hand, the converter must be capable to handle the lowest specified LED voltage. The auxiliary winding of the transformer generates the IC’s VCC supply voltage. As the minimum and maximum requirements for the supply voltage of the IC have a given ratio, the ratio of the lowest and highest LED voltage is also determined. Choose the auxiliary voltage carefully if a large LED voltage ratio is required. An LED voltage ratio up to three can be realized with this IC. The open output protection limits the output voltage to Umax / 0.85 when the circuit is designed according to the guidelines contained in this data sheet. |
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