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AN4461 Datasheet(PDF) 18 Page - STMicroelectronics

Part # AN4461
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

AN4461 Datasheet(HTML) 18 Page - STMicroelectronics

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ZVS LC resonant stage description
AN4461
18/70
DocID026130 Rev 2
It is useful, for further consideration to arrange Equation 5 as:
Equation 9
Then the ratio between minimum and maximum frequency can be expressed as:
Equation 10
Equation 10 can be simplified as follows:
Equation 11
Keeping into consideration transient effects and current variations, it is a good empiric
design practice to have:
Equation 12
The parameter
Γ is directly related with the ripple superimposed to the PFC output voltage.
An indication about the required transformer ratio is obtained combining Equation 11 and
Equation 9. A representation of the frequency range at a fixed current versus
Λ at different
values of the parameter
Γ is shown in Figure 9.
Figure 9. ZVS -
Λ
Λ
Λ
Λ vs. frequency
(
)
( )
0,1
λ
with
Vdout
VLED
2
min
Vpfc,
λ
n
∈
+
⋅
=
(
)2
2
2
2
min
hb,
max
hb,
λ
1
min
Vpfc,
Vdout
VLED
Vdout
λ
min
Vpfc,
max
Vpfc,
min
Vpfc,
1
max
ILED,
min
ILED,
f
f
−
⋅
+
⋅
⋅
−
⋅
⋅
=
(
)
max
ILED,
min
ILED,
Idim
and
min
Vpfc,
max
Vpfc,
with
λ
1
Idim
f
f
2
min
hb,
max
hb,
=
=
Γ
−
Γ
=
4
≤
Π
Λ
Θ
Κ
Ε
Π
∆[
Κ
ΕΙ
Ι



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