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AN2870 Datasheet(PDF) 30 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) 30 Page - STMicroelectronics

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Designing with L6585DE
AN2870
30/41
Equation 35
An example of characteristic curves is reported in Figure 15-A and B
Ballast inductor experiences the maximum current during ignition, when the operating point
is very close to the resonance frequency.
Equation 36
Rhbcs must be chosen in order to obtain the minimum ignition voltage across the lamp:
Equation 37
Rhbcs power rating can be calculated considering the RMS value of the low side current
during ignition.
In this case the bias point lies at a frequency close to the resonance frequency, therefore the
current flowing in resonant network is almost sinusoidal.
This allows the designer to approximate the RMS current to:
2
0
run
2
2
0
run
2
0
pk
,
bal
run
f
f
f
f
1
Q
Z
V
I
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
Figure 15.
(A) voltage frequency response
Figure 15.
(B) current frequency response
⎟⎟
⎟
⎟
⎟
⎟
⎟
⎟
⎠
⎞
⎜⎜
⎜
⎜
⎜
⎜
⎜
⎜
⎝
⎛
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
=
2
0
ign
2
2
0
ign
2
0
ign
0
pk
,
bal
ign
,
ballast
f
f
f
f
1
Q
f
f
Q
1
Z
V
I
ign
,
ballast
hbcsh
HBCS
I
V
R
=



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