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AN4501 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN4501
Description  Design of a boost LED driver using L99LD01
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4501 Datasheet(HTML) 16 Page - STMicroelectronics

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General considerations
AN4501
16/48
DocID026394 Rev 1
Figure 5. Converter switching frequency versus RSF value
The L99LD01 works as a fixed frequency boost converter. It is possible to add a pseudo-
random frequency modulation, which is controlled by a specific control register (see
datasheet). The so-called spread spectrum technique distributes the electromagnetic
disturbance over a wide frequency range, resulting in a reduction of the peak emission.
For clarity, in the rest of the document, we assume that this function is disabled.



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