công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

Preview PDF HTML

AN3112 bảng dữ liệu(PDF) 17 Page - STMicroelectronics

tên linh kiện AN3112
Giải thích chi tiết về linh kiện  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3112 bảng dữ liệu(HTML) 17 Page - STMicroelectronics

Back Button AN3112 Datasheet HTML 13Page - STMicroelectronics AN3112 Datasheet HTML 14Page - STMicroelectronics AN3112 Datasheet HTML 15Page - STMicroelectronics AN3112 Datasheet HTML 16Page - STMicroelectronics AN3112 Datasheet HTML 17Page - STMicroelectronics AN3112 Datasheet HTML 18Page - STMicroelectronics AN3112 Datasheet HTML 19Page - STMicroelectronics AN3112 Datasheet HTML 20Page - STMicroelectronics AN3112 Datasheet HTML 21Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 17 / 36 page
background image
AN3112
Designing a fixed-off-time PFC
Doc ID 16820 Rev 3
17/36
temperature), a factor of 1.75 to 2 should be taken into account. The exact factor can be
found on the device datasheet.
Now, combining equations
Equation 29 and Equation 16, the conduction losses referred to a
1
ΩRDS(on), at ambient temperature as a function of Pin and VAC can be calculated:
Equation 30
The generic switching losses due to the MOSFET commutation occurring at turn-on and
turn-off can be basically expressed by:
Equation 31
Because the switching frequency depends on the input line voltage and phase angle on the
sinusoidal waveform, it can be demonstrated that from
Equation 31 the switching losses per
1 µs of current, rise and fall-time can be written as:
Equation 32
From the STP12NM50FP datasheet trise = tfall = 0.01 µs is the crossover time at turn-on
and off.
At turn-on the losses are due to the discharge of the total drain capacitance inside the
MOSFET itself. In general, the capacitive losses are given by:
Equation 33
Where Cd is the total drain capacitance including the MOSFET and the other parasitic
capacitances such as inductor etc. At the drain node, VMOS is the drain voltage at MOSFET
turn-on.
Taking into account the frequency variation with the input line voltage and the phase angle,
the capacitive losses per 1 nF of total drain capacitance can be calculated as:
Equation 34
The total drain capacitance (Cd) of the two parallel MOSFETs is 0.36 nF, not including the
other component contributions, Vout is the drain voltage at MOSFET turn-on.
2
out
in
2
rms
cond
3
)
VAC
(
k
16
2
V
)
VAC
(
k
P
2
))
VAC
(
ISW
(
2
)
VAC
(
P
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
π
⋅
−
⋅
⋅
⋅
=
⋅
=
′
)
VAC
(
f
2
t
t
I
V
)
VAC
(
P
sw
fall
rise
MOS
MOS
switch
⋅
⎟
⎠
⎞
⎜
⎝
⎛
+
⋅
⋅
=
()
∫
π
ϑ
⋅
θ
⋅
ϑ
π
⋅
⎟⎟⎠
⎞
⎜⎜⎝
⎛
∆
−
⋅
=
′
0
sw
2
pk
max
pk
out
switch
d
)
,
VAC
(
f
sin
1
2
IL
IL
V
)
VAC
(
P
)
VAC
(
f
V
C
2
1
)
VAC
(
P
sw
MOS
2
d
cap
⋅
⋅
⋅
=
()
ϑ
⋅
ϑ
π
⋅
=
′
∫
π
d
)
,
VAC
(
f
V
1
2
1
)
VAC
(
P
0
sw
2
out
cap



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


bảng dữ liệu tải về

Go To PDF Page


Link URL



Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Liên kết đến bảng dữ liệu    |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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