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AN4382 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN4382
Description  100 W LED street lighting application using STLUX385A
PDF  70 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4382 Datasheet(HTML) 11 Page - STMicroelectronics

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DocID025437 Rev 1
11/70
AN4382
PFC stage
70
3
PFC stage
The STEVAL385LEDPSR demonstration board is based on two power conversion stages
where a first PFC stage generates the DC voltage to apply to the LC resonant stage. The LC
resonant stage controls the output current.
3.1
Constant TON working principles
Figure 4. PFC concept
The PFC stage is based on a boost converter operating in a transitional mode (also referred
as critical conduction or a boundary mode) using the constant on-time method.
In boost topology the variation of the inductor current during the conduction time of the main
switch (TON) depends on the input voltage as shown by Equation 1:
Equation 1
()
Boost
mains
ac
Lboost
L
t
f
sin2π
V
2
Ton
∆I
⋅
⋅
⋅
=



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