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AN2982 Datasheet(PDF) 17 Page - STMicroelectronics

Part # AN2982
Description  This application note describes the STEVAL-ILB005V2 demonstration board equipped with the L6585DE lighting controller
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2982 Datasheet(HTML) 17 Page - STMicroelectronics

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AN2982
Ballast stage design
Doc ID 15599 Rev 1
17/31
The RMS value of one side of the half bridge is equal to:
Equation 36
The power dissipation of the half-bridge current sense resistor is equal to:
Equation 37
A blocking capacitor Cblock = 100 nF (400 Vac) is used.
The choke form factor is an EF25 core (Ae = 52 mm
2, l
e = 58 mm, material N87 or
equivalent having Bmax<300 mT).
Its design parameters are as follows:
Equation 38
For this component a multi-conductor wire is also used to reduce the HF equivalent
resistance, and therefore the power dissipation.
2.2
Selection of parameters
Figure 12.
Parameters setting block
Cosc = 1 nF (5% or better) is chosen.
The following constant values are calculated (COSC in pF):
A
3465
.
0
f
f
f
f
1
Q
f
f
Q
1
Z
V
2
2
1
2
I
I
2
0
run
2
2
0
run
2
0
run
0
out
pk
,
ballast
RMS
,
hb
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
π
⋅
⋅
=
≈
mW
100
I
R
P
2
hbcs
hbcs
RMS
,
hbcs
<
⋅
≈
mm
37
.
3
L
A
N
2
l
turns
/
nH
8
.
38
N
L
A
turns
183
A
B
L
I
N
e
2
0
gap
2
2
L
e
max
max
=
μ
×
=
→
⎪
⎪
⎭
⎪⎪
⎬
⎫
=
=
=
=



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