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NXP Semiconductors
SSL2115X
Low-cost non-dimmable LED driver IC
limits the V LED when VCC reaches the V prot(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 U max / 0.85 when the circuit is
designed according to the guidelines contained in this data sheet.
SSL2115X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 7 June 2012
? NXP B.V. 2012. All rights reserved.
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