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AN2870 Datasheet(PDF) 29 Page - STMicroelectronics

Part # AN2870
Description  L6585DE combo IC
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2870 Datasheet(HTML) 29 Page - STMicroelectronics

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AN2870
Designing with L6585DE
29/41
Equation 31
L and C are chosen in order to fit the following constraints:
●
Preheating voltage has to be less than a value reported on lamp datasheet to avoid
early ignition.
Equation 32
●
In case of current controlled preheating, the Preheating current should be between two
values in order to obtain an effective preheating. These two values depend on the
preheating time, or, better, on the total energy delivered to the lamp during preheating.
Equation 33
●
Run frequency should be less than minimum ignition frequency. This frequency is the
frequency at which the voltage across the lamp reaches its maximum value (reported
on lamp datasheet).
Equation 34
ign
out
0
ign
pre
out
0
2
pre
0
out
pre
0
out
0
pre
2
run
0
out
2
2
2
0
run
V
2
V
2
1
f
f
V
V
2
1
f
)
OR
(
4
I
Z
V
2
I
Z
V
2
2
f
f
2
I
2
Q
Z
V
4
4
Q
1
2
Q
1
2
f
f
⋅
⋅
π
+
=
π
+
=
=
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎣
⎡
+
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
⋅
π
+
⋅
⋅
π
=
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
⋅
⋅
π
+
−
⎟
⎠
⎞
⎜
⎝
⎛ −
+
⎟
⎠
⎞
⎜
⎝
⎛ −
=
max
,
pre
pre
res
2
pre
0
0
pre
pk
,
bal
pre
V
f
f
f
f
f
f
V
V
<
⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
=
[]
max
,
ph
min
,
ph
2
pre
0
0
pre
0
pk
,
bal
pre
I
..
I
f
f
f
f
Z
V
I
∈
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
=
min
,
ign
res
2
min
,
ign
0
0
min
,
ign
pk
,
bal
ign
f
f
f
f
f
f
V
V
⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−
=



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