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AN2982 Datasheet(PDF) 21 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) 21 Page - STMicroelectronics

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AN2982
Ballast stage design
Doc ID 15599 Rev 1
21/31
2.5
IC power supply design
The IC current consumption depends on both the PFC frequency and half-bridge frequency.
In the worst case, the mean value of the PFC frequency is equal to 162 kHz and the
maximum half-bridge frequency is equal to 90 kHz.
With these values the maximum supply current is approximately equal to:
Equation 53
This current is delivered to the IC by means of a charge pump connected to the middle point
of the half bridge.
Figure 14.
Charge pump network and startup
The current delivered by the charge pump capacitor is approximately:
Equation 54
where:
Equation 55
and rearranging the terms:
Equation 56
The startup network works also as a detector of lamp presence. This feature can be
implemented by placing one or both of the lamp cathodes along the startup network path. If
the lamp is absent, the IC cannot start.
mA
11
56
.
4
f
0373
.
0
f
0192
.
0
I
kHz
mA
pre
kHz
PFC
cc
≈
+
+
⋅
=
cc
run
rise
pk
,
cp
cp
I
f
T
I
I
≥
⋅
⋅
=
rise
out
cp
pk
,
cp
T
V
C
I
=
→
=
⋅
≥
pF
558
f
V
I
C
run
OUT
cp
cp
C
cp
1nF
=



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