SSL21153T datasheet(6/15 Pages) NXP

6 / 15 page

SSL2115X

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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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