Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

1N4004 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte 1N4004
Spiegazioni elettronici  APPLICATION NOTE
Download  42 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

1N4004 Scheda tecnica(HTML) 6 Page - STMicroelectronics

Back Button 1N4004 Datasheet HTML 2Page - STMicroelectronics 1N4004 Datasheet HTML 3Page - STMicroelectronics 1N4004 Datasheet HTML 4Page - STMicroelectronics 1N4004 Datasheet HTML 5Page - STMicroelectronics 1N4004 Datasheet HTML 6Page - STMicroelectronics 1N4004 Datasheet HTML 7Page - STMicroelectronics 1N4004 Datasheet HTML 8Page - STMicroelectronics 1N4004 Datasheet HTML 9Page - STMicroelectronics 1N4004 Datasheet HTML 10Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 42 page
background image
AN1262 APPLICATION NOTE
6/42
6
INPUT BULK CAPACITOR SELECTION
The input bulk capacitor Cin, along with the bridge rectifier, converts the AC mains voltage to an unregulated
DC bus, Vin, which is the input voltage for the downstream flyback converter. Cin must be large enough to have
a relatively low ripple superimposed on top of the DC level, as shown in fig. 3. At minimum specified mains volt-
age, the value of Cin determines the absolute minimum, Vinmin, of the DC input voltage of the converter. The
maximum duty cycle and the maximum peak current allowed by the IC must not be exceeded at this voltage.
However, as to thermal consideration, the bus DC voltage (VDCmin @ VACmin) should be considered.
Figure 3. Input voltage waveforms:
a) without holdup capability;
b) with holdup capability.
Large values of Cin result in higher VDCmin and Vinmin, lower peak and RMS current through the power MOSFET
(i.e. less power dissipation in the device) and less duty cycle range to achieve regulation but, on the other hand,
also in bigger capacitor size, higher peak and RMS current drawn from the mains (i.e. more power dissipation
in the bridge rectifier). Small values of Cin give origin to the opposite situation.
Experience shows that a good compromise between these contrasting requirements is a Cin value that causes
the peak-to-peak ripple amplitude to be 25-30% of the peak mains voltage (@ VACmin), which means that Vinmin
will be 70-75% of the peak value. Anyway, if holdup capability is required, a much larger capacitance values will
be needed: the voltage ripple across Cin is expected to be 25-30% of the peak value, after 1 mains cycle miss-
ing, which means that in normal operation the ripple will be much less.
Table 5 summarizes the required capacitance per watt of input power for a given value of Vinmin, with and with-
out holdup requirement, and shows the resulting values of VDCmin. This allows to calculate the minimum capac-
itance needed, by multiplying the value taken from the table times Pin. Then a standard value will be selected,
taking also the tolerance into account.
a)
Vin
VPKmin
Vinmin
VDCmin
TC
1
fL
Vin
VPKmin
Vinmin
after fail
VDCmin
TC
after fail
1 missing cycle
b)
Vinmin
TC


Codice articolo simile - 1N4004

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Pan Jit International I...
1N4004 PANJIT-1N4004 Datasheet
53Kb / 2P
   PLASTIC SILICON RECTIFIER(VOLTAGE - 50 to 1000 Volts CURRENT - 1.0 Ampere)
logo
EIC discrete Semiconduc...
1N4004 EIC-1N4004 Datasheet
54Kb / 2P
   SILICON RECTIFIER DIODES
logo
Pan Jit International I...
1N4004 PANJIT-1N4004 Datasheet
96Kb / 2P
   PLASTIC SILICON RECTIFIERS
logo
Guangdong Juxing Electr...
1N4004 JUXING-1N4004 Datasheet
1Mb / 2P
   SILICON RECTIFIER
logo
Central Semiconductor C...
1N4004 CENTRAL-1N4004 Datasheet
72Kb / 2P
   AMP SILICON RECTIFIER
More results

Descrizione simile - 1N4004

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Analog Devices
AN-236 AD-AN-236 Datasheet
164Kb / 3P
   APPLICATION NOTE
AN-686 AD-AN-686 Datasheet
55Kb / 2P
   APPLICATION NOTE
REV. 0
logo
Vectron International, ...
TFS211C VECTRON-TFS211C_03 Datasheet
40Kb / 2P
   Application Note
TFS199D VECTRON-TFS199D_08 Datasheet
25Kb / 1P
   Application Note
TFS380K VECTRON-TFS380K Datasheet
28Kb / 1P
   Application Note
TFS433K VECTRON-TFS433K_01 Datasheet
25Kb / 1P
   Application Note
logo
International Rectifier
AN-1070 IRF-AN-1070 Datasheet
241Kb / 14P
   Application Note
AN-1086 IRF-AN-1086 Datasheet
181Kb / 9P
   Application Note
logo
Vectron International, ...
TFS248E_0208 VECTRON-TFS248E_0208 Datasheet
13Kb / 1P
   Application Note
TFS321_0106 VECTRON-TFS321_0106 Datasheet
43Kb / 3P
   Application Note
logo
International Rectifier
AN-1204 IRF-AN-1204 Datasheet
916Kb / 11P
   Application Note
More results


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




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   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