поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

LD7550BN датащи(PDF) 8 Page - List of Unclassifed Manufacturers

номер детали LD7550BN
подробное описание детали  Green-Mode PWM Controller
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  ETC1 [List of Unclassifed Manufacturers]
домашняя страница  
Logo ETC1 - List of Unclassifed Manufacturers

LD7550BN датащи(HTML) 8 Page - List of Unclassifed Manufacturers

Back Button LD7550BN Datasheet HTML 2Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 3Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 4Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 5Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 6Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 7Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 8Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 9Page - List of Unclassifed Manufacturers LD7550BN Datasheet HTML 10Page - List of Unclassifed Manufacturers  
Zoom Inzoom in Zoom Outzoom out
 8 / 10 page
background image
LD7550
8
Leadtrend Technology Corporation
LD7550-DS-00 August 2004
reduce the switching cycles under light-load or no-load
condition either by skip some switching pulses or reduce the
switching frequency.
What
LD7550
used
to
implement
the
power-saving
operation is Leadtrend Technology’s own IP
2
.
In such
approach, as shown in the block diagram, 2 oscillators are
implemented in LD7550. The first oscillator is to take care
the normal switching frequency, which can be set by the RT
pin through an external resistor. Under this operation mode,
as shown in Fig. 10, the 2
nd
oscillation (green-mode
oscillator) is not activated. Therefore, the rising-time and the
falling-time of the internal ramp will be constant to achieve
good stability over all temperature range.
Under the
normal operation, this oscillator is dominated the switching
frequency.
OSC
COMP
CS
OUT
PWM
Comparator
LEB
2R
R
R
S
Q
EN
EN=1
+
+
Ramp from
Oscillator
V+
V-
Set
Reset
Green-Mode
Osc
Green-Mode Osc is not activated
under normal operation.
Fig. 10
As shown in Fig. 11, the green-mode oscillator detects the
Comp pin signal to determine if it is within the green-mode
operation.
When the detected signal V+ is lower than the
green-mode threshold VGREEN, the green-mode oscillator is
on. The green-mode oscillator, implemented by a VCO
(voltage controlled oscillator), is a variable frequency
oscillator. The rising time of the VCO is proportional to
(VGREEN-V+), thus the lower voltage on V+ will generate
longer rising time on VCO as well as lower frequency on
VCO.
By using this dual-oscillator control, the green-mode
frequency can be well controlled and further to avoid the
generation of audible noise.
V+
V-
Ramp of
OSC
Green-Mode
Oscillator activated
Vgreen
Normal Mode
Green Mode
Ramp of
VCO
VCO
Level-detector
& Counter
Vgreen
V+
(V+ -Vgreen) >=0, VCO disabled
(V+ -Vgreen) <0, VCO activated
Green-Mode
Oscillator
from OSC
"Set" Signal
(to OSC & Nor gate)
Fig. 11
2 Note: Patent pending


Аналогичный номер детали - LD7550BN

производительномер деталидатащиподробное описание детали
logo
List of Unclassifed Man...
LD7552 ETC1-LD7552 Datasheet
214Kb / 10P
   GREEN MODE PWM CONTROLLER
logo
Leadtrend Technology
LD7552B LEADTREND-LD7552B Datasheet
300Kb / 16P
   Green-Mode PWM Controller with Integrated Protections
LD7552BGS LEADTREND-LD7552BGS Datasheet
300Kb / 16P
   Green-Mode PWM Controller with Integrated Protections
logo
List of Unclassifed Man...
LD7552BN ETC1-LD7552BN Datasheet
214Kb / 10P
   GREEN MODE PWM CONTROLLER
logo
Leadtrend Technology
LD7552BPN LEADTREND-LD7552BPN Datasheet
300Kb / 16P
   Green-Mode PWM Controller with Integrated Protections
More results

Аналогичное описание - LD7550BN

производительномер деталидатащиподробное описание детали
logo
BCD Semiconductor Manuf...
AP3102M-G1 BCDSEMI-AP3102M-G1 Datasheet
1Mb / 17P
   GREEN MODE PWM CONTROLLER
logo
Stanson Technology
ST8835 STANSON-ST8835 Datasheet
816Kb / 13P
   Green-Mode PWM Controller
logo
Diodes Incorporated
AP3127 DIODES-AP3127 Datasheet
441Kb / 13P
   GREEN MODE PWM CONTROLLER
logo
Bookly Micro electronic
BM0853 BOOKLY-BM0853 Datasheet
972Kb / 11P
   Green-Mode PWM Controller
logo
Diodes Incorporated
AP3102 DIODES-AP3102 Datasheet
617Kb / 14P
   GREEN MODE PWM CONTROLLER
logo
SYNC POWER Crop.
SP6850 SYNC-POWER-SP6850 Datasheet
258Kb / 10P
   Green-Mode PWM Controller
logo
Diodes Incorporated
AP3101 DIODES-AP3101 Datasheet
378Kb / 12P
   GREEN MODE PWM CONTROLLER
logo
Stanson Technology
ST6850 STANSON-ST6850 Datasheet
137Kb / 10P
   Green-Mode PWM Controller
logo
Diodes Incorporated
AP3125B DIODES-AP3125B Datasheet
479Kb / 12P
   GREEN MODE PWM CONTROLLER
AP31251 DIODES-AP31251 Datasheet
412Kb / 13P
   GREEN MODE PWM CONTROLLER
Rev. 2 - 2 December 2019
More results


Html Pages

1 2 3 4 5 6 7 8 9 10


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