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AN2982 数据表(PDF) 5 Page - STMicroelectronics

部件名 AN2982
功能描述  This application note describes the STEVAL-ILB005V2 demonstration board equipped with the L6585DE lighting controller
PDF  31 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2982 数据表(HTML) 5 Page - STMicroelectronics

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AN2982
Designing the application
Doc ID 15599 Rev 1
5/31
1.2
PFC design
1.2.1
Output voltage and dynamic OVP
The maximum input voltage is equal to:
Equation 1
An output voltage equal to Vout = 420 V is chosen for better PFC performance.
Choosing Rinvh = 3 x 2.2 MΩ, the output voltage is equal to:
Equation 2
The ripple superimposed on Vout is chosen equal to 5%. Then, the maximum instantaneous
output voltage is equal to 441 V and, therefore, the OVP level must be comprised between
450 V and 500 V.
–VOVP = 480 V is chosen and the CTR pin voltage divider is dimensioned
accordingly
–Rctrh = 3 x 825 kΩ
Equation 3
1.2.2
Boost choke design
The minimum PFC frequency is chosen equal to fPFC,min > 15 kHz. The maximum
inductance value is equal to:
Equation 4
Lpfc = 1.5 mH is selected. The following graph depicts the frequencies that are obtained
along the mains period for various input voltages.
V
7
.
391
2
V
277
V
max
,
in
=
⋅
=
→
Ω
=
⎟
⎠
⎞
⎜
⎝
⎛
−
=
→
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
=
39839
1
V
52
.
2
V
R
R
R
R
1
V
52
.
2
V
out
invh
invl
invl
invh
out
R
invi
39.7 k
Ω
=
→
Ω
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
=
→
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
=
17656
1
V
4
.
3
V
R
R
R
R
1
V
4
.
3
V
MAX
,
OUT
ctrh
ctrl
ctrl
ctrh
OVP
R
invi
18 k
Ω
=
mH
6
.
2
V
V
2
1
f
P
2
V
L
V
V
2
1
L
P
2
V
f
out
in
min
,
PFC
in
2
in
out
in
in
2
in
min
,
PFC
=
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
−
⋅
⋅
⋅
≤
→
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
−
⋅
⋅
⋅
=



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