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AN4461 Datasheet(PDF) 19 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) 19 Page - STMicroelectronics

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DocID026130 Rev 2
19/70
AN4461
ZVS LC resonant stage description
70
4.1.2
LC stage characteristic selection
The following procedure can be used to determine the main component values.
Step1: Determine the primary-to-secondary turn ratio n of the transformer.
From Equation 11 we derive:
Equation 13
Use Equation 14 to calculate
Λ for maximum LED current.
Note:
fhb,max and fhb,max shall be selected so that Λ < 0.9 in order to account for rounding errors,
mismatch and tolerances in the transformers.
Equation 15 can now be used to calculate the transformer transfer ratio n as:
Equation 14
Vdout is the forward voltage of the output rectified (0.5 V for a Schottky rectifiers, 0.8 V for
p-n rectifiers or Shottky based Wien bridge rectifiers).
Step 2: Use Table 2 to calculate the current in different point of the circuit.
Table 2. Current values
min
hb,
max
hb,
f
f
min
Vpfc,
max
Vpfc,
1
λ
⋅
−
=
Parameter
Primary side
Secondary side
Peak current
Total current swing
DC current
Total RMS current
AC RMS current
(
)
Vdout
VLED
2
min
Vpfc,
λ
NSEC
NPRI
n
+
⋅
=
=
ILED
n
2
Ippk
=
ILED
2
Ispk
⋅
=
ILED
n
4
Ippk
2
Ip
=
⋅
=
∆
ILED
2
Ispk
Is
⋅
=
=
∆
(
)
Vpfc
Vdout
VLED
ILED
Iin
ILED
n
1
Ipav
0
Ipdc
+
⋅
=
=
=
ILED
Isdc
=
ILED
3
n
2
Iprms
=
ILED
3
2
Isrms
=
ILED
3
n
2
Ipac
=
ILED
3
1
Isac
=



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