поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

FDS3670 датащи(PDF) 7 Page - Fairchild Semiconductor

номер детали FDS3670
подробное описание детали  Power Converter Topology and MOSFET Selection for 48-V Telecom
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FDS3670 датащи(HTML) 7 Page - Fairchild Semiconductor

Back Button FDS3670 Datasheet HTML 3Page - Fairchild Semiconductor FDS3670 Datasheet HTML 4Page - Fairchild Semiconductor FDS3670 Datasheet HTML 5Page - Fairchild Semiconductor FDS3670 Datasheet HTML 6Page - Fairchild Semiconductor FDS3670 Datasheet HTML 7Page - Fairchild Semiconductor FDS3670 Datasheet HTML 8Page - Fairchild Semiconductor FDS3670 Datasheet HTML 9Page - Fairchild Semiconductor FDS3670 Datasheet HTML 10Page - Fairchild Semiconductor FDS3670 Datasheet HTML 11Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 12 page
background image
7
Rev. A, June 2001
©2001 Fairchild Semiconductor Corporation
Double-Ended Topologies
There are several commonly employed variants of double-ended converters. The terminology
implies that the magnetic flux swing in the transformer primary is bi-directional. In other words,
the transformer is being actively driven in two directions, as opposed to the forward and fly-
back topologies where the transformer is driven in one direction and allowed to reset its core
flux naturally. The double-ended approach has the advantage of utilizing the core volume more
efficiently, and therefore allowing the use of a physically smaller transformer core. The price
paid for this better utilization is more power switches and more complex transformer windings.
There are two main topologies to discuss, push-pull and bridge.
Push-Pull Designs
Figure 8 shows a basic push-pull design. The main advantage of this design is grounded-
source switches. This allows for a simple gate-drive design, requiring only two switches. The
main disadvantage, like the single transistor forward and flyback designs, is the drain voltage
of the two switches is inherently unconstrained. Therefore, there will typically be some form of
snubbing and/or clamping, usually passive, on the FET drains. Operation is quite simple. Each
FET gets turned on for some fraction of one half of an entire cycle. If each FET were to be
operated for exactly 50% of a full period, the effective duty factor at the output of the second-
ary rectifiers would be 100%. This cannot be accomplished in practice, but a close approxima-
tion can be achieved. Also, the effective secondary side ripple frequency is doubled. This
helps to minimize the size of the secondary inductor. Figure 9 shows idealized gate drive, FET
drain, and transformer secondary waveforms. It should be noted that the theoretical minimum
drain voltage seen by a primary FET in this configuration is 2-times the DC input voltage. As
one FET is driven on, a voltage of Vin is developed across one half of the transformer primary.
An equal voltage will be induced in the other half of the winding. This voltage is added to the
input voltage, and impressed on the drain of the off FET. Since there is also unclamped leak-
age inductance associated with the transformer primary, there will be spikes substantially
higher than twice the input. Consequently, only the 200V FDS2670 is suitable for applications
where inputs as high as 72V could occur. About twice the power level of a single transistor
forward converter can be obtained.
Figure 8. A basic push-pull design.
D
COUT
VO
D
T
Q1
CONTROL
L
+
CIN
VIN
+
+
Q2


Аналогичный номер детали - FDS3670

производительномер деталидатащиподробное описание детали
logo
Fairchild Semiconductor
FDS3670 FAIRCHILD-FDS3670 Datasheet
204Kb / 8P
   100V N-Channel PowerTrench??MOSFET
FDS3670 FAIRCHILD-FDS3670 Datasheet
85Kb / 5P
   100V N-Channel PowerTrench MOSFET
FDS3670_0011 FAIRCHILD-FDS3670_0011 Datasheet
85Kb / 5P
   100V N-Channel PowerTrench MOSFET
More results

Аналогичное описание - FDS3670

производительномер деталидатащиподробное описание детали
logo
Fairchild Semiconductor
7004 FAIRCHILD-7004 Datasheet
85Kb / 12P
   Power Converter Topology
logo
ON Semiconductor
NCP1561 ONSEMI-NCP1561 Datasheet
250Kb / 22P
   Push-Pull PWM Controller for 48 V Telecom Systems
August, 2004 ??Rev. 3
NCP1031MNTXG ONSEMI-NCP1031MNTXG Datasheet
444Kb / 19P
   Low Power PWM Controller with On--Chip Power Switch and Startup Circuits for 48 V Telecom Systems
December, 2010 -- Rev. 10
NCP1030 ONSEMI-NCP1030 Datasheet
142Kb / 18P
   Low Power PWM Controller with On-Chip Power Switch and Startup Circuits for 48 V Telecom Systems
December, 2010 -- Rev. 10
NCP1030 ONSEMI-NCP1030_06 Datasheet
166Kb / 18P
   Low Power PWM Controller with On?묬hip Power Switch and Startup Circuits for 48V Telecom Systems
January, 2006 ??Rev. 6
NCP1030 ONSEMI-NCP1030 Datasheet
444Kb / 19P
   Low Power PWM Controller with On--Chip Power Switch and Startup Circuits for 48 V Telecom Systems
December, 2010 -- Rev. 10
logo
Vishay Siliconix
SI9117 VISHAY-SI9117 Datasheet
132Kb / 15P
   High-Frequency Converter for Telecom Applications
Rev. E, 19-Apr-04
logo
ALPS ELECTRIC CO.,LTD.
SDDE ALPS-SDDE Datasheet
1,014Kb / 3P
   One switch for main power, mode selection and start
logo
International Rectifier
IRF7823PBF IRF-IRF7823PBF Datasheet
669Kb / 10P
   Power MOSFET Selection for Non-Isolated DC/DC Converters
logo
Vishay Siliconix
SIHW47N65E VISHAY-SIHW47N65E Datasheet
161Kb / 7P
   Server and telecom power supplies
Rev. C, 02-Dec-13
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
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