Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

Preview PDF HTML

AN4213 Scheda tecnica(PDF) 20 Page - STMicroelectronics

Il numero della parte AN4213
Spiegazioni elettronici  Fluorescent lamps are increasingly driven by electronic
PDF  42 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4213 Scheda tecnica(HTML) 20 Page - STMicroelectronics

Back Button AN4213 Datasheet HTML 16Page - STMicroelectronics AN4213 Datasheet HTML 17Page - STMicroelectronics AN4213 Datasheet HTML 18Page - STMicroelectronics AN4213 Datasheet HTML 19Page - STMicroelectronics AN4213 Datasheet HTML 20Page - STMicroelectronics AN4213 Datasheet HTML 21Page - STMicroelectronics AN4213 Datasheet HTML 22Page - STMicroelectronics AN4213 Datasheet HTML 23Page - STMicroelectronics AN4213 Datasheet HTML 24Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 20 / 42 page
background image
Designing a TM PFC
AN4213
20/42
DocID023984 Rev 2
The maximum main-auxiliary winding turn ratio, nmax, has to ensure that the voltage
delivered to the pin during the OFF-time of the Power MOSFET is sufficient to arm the ZCD
circuit.
Equation 36
The minimum value of the limiting resistor can be found assuming 0.8 mA current through
the pin and considering the maximum voltage across the auxiliary winding with a selected
turn ratio n = 10. The actual value can be fine-tuned in order to make the turn-on of the
Power MOSFET occur exactly on the valley of the drain voltage oscillation (the boost
inductor, completely discharged, is ringing with the drain capacitance, as shown in the figure
below). This will minimize the power dissipation at turn-on.
Figure 10. Optimum Power MOSFET turn-on
Equation 37
Equation 38
7
.
15
15
.
1
4
.
1
2
max
sec
≤
∗
−
≤
≤
n
V
V
n
n
n
AC
OUT
ondary
primary
AM17324v1
Vout
Vdrain
Vipk
Vzcd
5.7
0.7
1.4
t
t
Ω
=
−
=
−
=
k
mA
mA
V
n
V
R
ZCDH
out
9
.
42
8
.
0
7
.
5
10
400
8
.
0
1
Ω
=
−
∗
=
−
=
k
mA
mA
V
n
V
R
ZCDL
AC
8
.
46
8
.
0
0
10
265
2
8
.
0
2
max
2



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


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