Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

Preview PDF HTML

AN2982 Scheda tecnica(PDF) 7 Page - STMicroelectronics

Il numero della parte AN2982
Spiegazioni elettronici  This application note describes the STEVAL-ILB005V2 demonstration board equipped with the L6585DE lighting controller
PDF  31 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2982 Scheda tecnica(HTML) 7 Page - STMicroelectronics

Back Button AN2982 Datasheet HTML 3Page - STMicroelectronics AN2982 Datasheet HTML 4Page - STMicroelectronics AN2982 Datasheet HTML 5Page - STMicroelectronics AN2982 Datasheet HTML 6Page - STMicroelectronics AN2982 Datasheet HTML 7Page - STMicroelectronics AN2982 Datasheet HTML 8Page - STMicroelectronics AN2982 Datasheet HTML 9Page - STMicroelectronics AN2982 Datasheet HTML 10Page - STMicroelectronics AN2982 Datasheet HTML 11Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 31 page
background image
AN2982
Designing the application
Doc ID 15599 Rev 1
7/31
When the maximum RMS current is obtained, the minimum frequency is detected and the
RHF of the choke must be less than:
Equation 8
Using a 13 x 0.1 mm2 wire, 3.5 Ω is obtained.
The core losses, at minimum input voltage, are estimated below 0.35 W, therefore the total
losses are lower than 2.5 W as expected. The higher the input voltage is, the lower the
power dissipation (e.g. at 220 Vac the estimated total power losses are lower than 1.8 W).
The transformer ratio can be calculated as:
Equation 9
Considering a maximum ZCD current equal to 1 mA, the limiting resistor is:
Equation 10
1.2.3
MOSFET selection
The PFC MOSFET must have a Vbdss = 500 V and a peak drain current greater than
Id,max = 2.2 A.
The maximum allowed MOSFET dissipation is equal to PMOS,max = 1 W in all conditions.
The total power dissipation is composed of:
●
Conduction losses, dominant at low input voltage:
Equation 11
Equation 12
●
Switching losses, directly proportional to the average switching frequency:
Equation 13
Ω
=
=
Ω
4
I
P
R
2
RMS
,
L
,
L
max
,
HF
(
)
→
=
→
<
→
⋅
>
⋅
−
=
6
m
18
.
14
m
V
4
.
1
m
V
2
V
V
in
out
zcd
,
aux
N
sec
29turns
=
→
⋅
⋅
=
ZCD
max
,
in
zcd
I
m
V
2
R
R
zcd
65.3 k
Ω
R
zcd
75 k
Ω
=
→
>
2
on
,
ds
out
rms
,
in
2
rms
,
in
in
on
,
ds
2
RMS
,
MOS
on
,
ds
COND
A
5278
.
0
R
V
V
9
2
4
6
1
V
P
8
R
I
R
P
⋅
=
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
π
−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
=
⋅
=
2
max
,
COND
)
on
(
DS
A
5278
.
0
P
(max)
R
<
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
π
−
⋅
⋅
=
out
RMS
,
IN
in
2
RMS
,
in
SW
V
V
2
2
1
L
P
2
V
f



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


Scheda tecnica Scarica

Go To PDF Page


Link URL



Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   Collegamento alla scheda tecnica    |   scambio Link   |   Ricerca produttore
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