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AN2982 Datasheet(PDF) 10 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) 10 Page - STMicroelectronics

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Designing the application
AN2982
10/31
Doc ID 15599 Rev 1
The RMS value of the bulk capacitor current is:
Equation 22
Considering the first term of Equation 21 as dominant, Cout > 10.2 µF, and then Cout = 22 µF
is selected.
The voltage rating of the capacitor is equal to VCout = 450 V and the temperature class is
TCout = 105 °C. With this value the typical ESR is around 2 Ω, adding only 740 mV to the
total ripple.
1.2.6
Multiplier biasing and selection of PFC current sense resistor
The peak values of the input voltage are between 124.4 V and 391.7 V. The ratio between
these two values is equal to 3.15. The MULT pin is biased to 1 V when input voltage is equal
to 124.4 V. If Rmulth = 3x680 kΩ:
Equation 23
Figure 5.
Multiplier bias points
with VCS,1 = 0.75 V:
Equation 24
A Cmult=1 nF capacitor is used in parallel with Rmultl for HF noise filtering.
mA
373
V
P
V
V
P
9
2
32
I
2
out
out
out
rms
,
in
2
in
RMS
,
Cout
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
⋅
⋅
π
⋅
=
→
Ω
=
−
=
→
=
=
k
53
.
16
R
kp
1
kp
R
00804
.
0
V
V
kp
multh
multl
pk
min
,
in
1
,
MULT
R
multh
16.2 k
Ω
=
→
Ω
=
⋅
⋅
⋅
=
=
364
.
0
P
2
2
V
V
I
V
R
in
min
,
in
1
,
CS
max
,
L
1
,
CS
pfccs
R
pfccs
0.33
Ω
=



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