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AN4501 Datasheet(PDF) 26 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) 26 Page - STMicroelectronics

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Selection of the freewheeling diode
AN4501
26/48
DocID026394 Rev 1
VOUT,OVTH must be set to a value which is higher than VLED,MAX.
The overvoltage threshold is determined by the resistors R1 and R2 (see Figure 11):
where OV_TH1 is typically 3.5 V (refer to datasheet of the L99LD01).
Figure 11. Feedback resistors for output over-voltage detection
The minimum breakdown, with a margin of 20% gives:
Equation 17:
VBRMIN = 1.2 x VOUT,OVTH
V
OUT,OVTH
OV_TH1
1
R
1
R
2
-------
+



×
=



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