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AN2870 bảng dữ liệu(PDF) 27 Page - STMicroelectronics

tên linh kiện AN2870
Giải thích chi tiết về linh kiện  L6585DE combo IC
PDF  41 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2870 bảng dữ liệu(HTML) 27 Page - STMicroelectronics

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AN2870
Designing with L6585DE
27/41
Where Rout is the effective resistance of the load (i.e. VOUT
2/P
OUT), kM is the multiplier gain
(reported in datasheet) and Cout is the bulk capacitor.
In order to compensate the loop and reject the ripple superimposed to the output voltage,
the loop gain at 100 Hz should be less than -60 dB. The transfer function of the error
amplifier, compensated with a simple capacitor can be written as:
Equation 25
and:
Equation 26
Using a high value for
Rinvh the value of Ccomp is reduced.
Input rectifier
This component is needed to supply the PFC stage with a rectified voltage.
The reverse voltage should be greater than twice Vin,max, the forward current greater than
maximum input current and the power dissipation greater than:
Equation 27
Input capacitor
At this stage of design the current absorption is impulsive. The mean value of this current is
in phase with the input voltage, but the high frequency components have amplitude equal to
twice the amplitude of the mean value, therefore can create interferences with nearby
electronic equipment. An input filter capacitor must be placed between the rectifier and the
PFC stage in order to reduce the high frequency current ripple superimposed to the input
current.
Let be r the maximum allowed ratio between ripple amplitude and mean value of the input
current:
Equation 28
()
invh
comp
comp
R
sC
1
s
G
=
()
()
()
001
.
0
2
C
R
s
1
1
R
R
V
V
k
k
4
1
R
sC
1
s
G
s
G
s
G
Hz
100
2
s
out
out
pfccs
out
out
2
rms
,
in
p
M
invh
comp
comp
loop
=
⎟
⎟
⎟
⎟
⎠
⎞
⎜
⎜
⎜
⎜
⎝
⎛
+
⋅
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
=
⋅
=
π
=
F
(min)
rms
,
in
in
F
(max)
rms
,
in
B
V
V
P
2
2
V
I
2
4
P
=
=
2
(min)
RMS
,
in
sw
in
(min)
RMS
,
in
min
sw
RMS
,
in
min
,
in
V
f
r
2
P
V
f
r
2
I
C
min
⋅
⋅
⋅
π
=
⋅
⋅
⋅
π
=



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