전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

Preview PDF HTML

AN3142 데이터시트(PDF) 28 Page - STMicroelectronics

부품명 AN3142
상세설명  Solution for designing a 400 W fixed-off-time controlled
PDF  44 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3142 데이터시트(HTML) 28 Page - STMicroelectronics

Back Button AN3142 Datasheet HTML 24Page - STMicroelectronics AN3142 Datasheet HTML 25Page - STMicroelectronics AN3142 Datasheet HTML 26Page - STMicroelectronics AN3142 Datasheet HTML 27Page - STMicroelectronics AN3142 Datasheet HTML 28Page - STMicroelectronics AN3142 Datasheet HTML 29Page - STMicroelectronics AN3142 Datasheet HTML 30Page - STMicroelectronics AN3142 Datasheet HTML 31Page - STMicroelectronics AN3142 Datasheet HTML 32Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 28 / 44 page
background image
Designing a fixed-off-time PFC
AN3142
28/44
Doc ID 17005 Rev 3
at minimum mains voltage, as set in
Equation 1, guarantee against parameter variation, the
mentioned tolerances should be taken into account, making some calculations considering
the worst cases.
In this case, taking into account the resistors and threshold tolerances, 1 M
Ω and a 56 kΩ
have been calculated, therefore the actual divider ratio is 0.946. Then the following check
can be done:
Equation 55
Equation 56
Equation 57
Equation 58
Pin 11 (ZCD) is the input of the zero current detector circuit. In FOT mode, it is connected to
the Line-Modulated-Fixed-Off-Time circuit seen in
Figure 6. Taking into account the
information contained in
Section 3, the starting point for the design of that circuit is the pair
of the desired values for TOFF on the top of the line voltage sinusoid at minimum (TOFF @
VACmin) and maximum line (TOFF @ VACmax) obtained by setting the switching frequency on
the peak of the sinusoid at low mains and considering the minimum on-time of the L6563S:
Equation 59
L
_
FF
H
_
FF
L
_
FF
EN
_
RUN
ENABLE
_
FF
R
R
R
V
V
+
⋅
=
V
923
.
0
M
1
k
56
M
1
V
88
.
0
V
ENABLE
_
FF
=
Ω
Ω
+
Ω
⋅
=
multL
multL
multH
EN
_
FF
START
_
in
R
R
R
2
mV
20
V
V
+
⋅
⎟⎟⎠
⎞
⎜⎜⎝
⎛
+
=
Vac
87
k
51
k
51
M
6
.
6
2
mV
20
V
923
.
0
V
START
_
in
=
Ω
Ω
+
Ω
⋅
⎟⎟⎠
⎞
⎜⎜⎝
⎛
+
=
L
_
FF
H
_
FF
L
_
FF
DIS
_
RUN
DISABLE
_
FF
R
R
R
V
V
+
⋅
=
V
844
.
0
M
1
k
56
M
1
V
80
.
0
V
DISABLE
_
FF
=
Ω
Ω
+
Ω
⋅
=
multL
multL
multH
DIS
_
FF
STOP
_
in
R
R
R
2
mV
20
V
V
+
⋅
⎟⎟⎠
⎞
⎜⎜⎝
⎛
+
=
Vac
9
.
79
k
51
k
51
M
6
.
6
2
mV
20
V
844
.
0
V
STOP
_
in
=
Ω
Ω
+
Ω
⋅
⎟⎟⎠
⎞
⎜⎜⎝
⎛
+
=
min
sw
min
min
OFF
f
k
)
VAC
(
T
=
s
76
.
3
ns
220
kHz
80
32
.
0
)
VAC
(
T
min
OFF
µ
=
−
=



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44


데이터시트 다운로드

Go To PDF Page


링크 URL



ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크 투 데이터시트    |   링크교환   |   제조사별 검색
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com