поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

UC3656G-AF5-R датащи(PDF) 6 Page - Unisonic Technologies

номер детали UC3656G-AF5-R
подробное описание детали  1MHz, 800mA SYNCHRONOUS BUCK CONTROLLER
Download  7 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3656G-AF5-R датащи(HTML) 6 Page - Unisonic Technologies

  UC3656G-AF5-R Datasheet HTML 1Page - Unisonic Technologies UC3656G-AF5-R Datasheet HTML 2Page - Unisonic Technologies UC3656G-AF5-R Datasheet HTML 3Page - Unisonic Technologies UC3656G-AF5-R Datasheet HTML 4Page - Unisonic Technologies UC3656G-AF5-R Datasheet HTML 5Page - Unisonic Technologies UC3656G-AF5-R Datasheet HTML 6Page - Unisonic Technologies UC3656G-AF5-R Datasheet HTML 7Page - Unisonic Technologies  
Zoom Inzoom in Zoom Outzoom out
 6 / 7 page
background image
UC3656
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 7
www.unisonic.com.tw
QW-R502-469.b
APPLICATION INFORMATION
Capacitor Selection
Proper selection of capacitors using the UTC UC3656 plays a critical role for system performance. The source
current of the top MOSFET is square wave of duty cycle in a continuous mode.
The input capacitor is generally used to provide a low impedance loop for the edges of pulsed current drawn by
the UTC UC3656. A load step at the output can induce ringing at the input VIN. This ringing can couple to the output
and be mistaken as loop instability. Increasing the capacitance of the input capacitor can great improve the
oscillation. A typical value is 4.7~ 22μF ceramic (X5R or X7R), POSCAP or Aluminum Polymer. With these
capacitors, better high frequency bypassing is achieved; resistive losses are thus reduced by their low ESR for
higher efficiency. Moreover, the input capacitor RMS current changes with the input voltage and the output voltage.
The maximum RMS current in the input capacitor can be expressed in the following formula:
)
V
V
(
V
V
I
I
IN
O
IN
O
OMAX
RMS
=
1
The output capacitor depends upon the suitable ripple voltage. Low ripple voltage corresponds to lower effective
series resistance (ESR).
The output ripple voltage can be calculated by:
)
fC
ESR
(
I
V
OUT
L
OUT
8
1
+
Δ
Δ
The formula as follows shows the output capacitor RMS ripple current:
IN
OUT
IN
OUT
RMS
V
f
L
)
V
V
(
V
I
×
×
×
=
3
2
1
For the UTC UC3656, X5R or X7R dielectric formulations have the priority in choosing the input and output
ceramic capacitors. This is because these dielectrics provide the best temperature and voltage characteristics of all
the ceramics for a given value and size.
Inductor Selection
Selecting an optimum inductor is dependent upon the expected ripple current and large value inductors lower
ripple current and small value inductors result in higher ripple current. In addition, the losses associated with the
DCR and its effect on the total converter efficiency should be taken consideration.
The inductor is also chosen to limit the ripple current to some pre-fixed value, approx. 20 ~ 40% (TYP.) of the
full load current at the maximum input voltage.
The inductance value can be calculated in the following equation:
OUT(MAX)
L
I
0.4
~
.
I
×
=
Δ
2
0
)
V
V
(
I
f
V
L
IN
OUT
L
OUT
Δ
×
=
1
Adjustable Output Voltage
A resistive divider adjusts the output voltage of the UTC UC3656, which divides a 0.6V reference voltage at FB
pin. The output voltage can be obtained by the equation as follows:
2
1
0.6
(1
)
OUT
R
VV
R
=× +


Аналогичный номер детали - UC3656G-AF5-R

производительномер деталидатащиподробное описание детали
logo
Unisonic Technologies
UC3656G-AF5-R UTC-UC3656G-AF5-R Datasheet
178Kb / 7P
   1MHz,800mA SYNCHRONOUS BUCK CONTROLLER
UC3656G-AF5-R UTC-UC3656G-AF5-R Datasheet
372Kb / 7P
   1.6MHz, 1A SYNCHRONOUS BUCK CONVERTER
More results

Аналогичное описание - UC3656G-AF5-R

производительномер деталидатащиподробное описание детали
logo
List of Unclassifed Man...
AT1366 ETC-AT1366 Datasheet
903Kb / 13P
   1MHZ 800MA SYNCHRONOUS BUCK CONTROLLER
logo
Unisonic Technologies
UC3656 UTC-UC3656 Datasheet
178Kb / 7P
   1MHz,800mA SYNCHRONOUS BUCK CONTROLLER
logo
Aimtron Technology
AT1366B AIMTRON-AT1366B Datasheet
347Kb / 14P
   1MHz,800mA Synchronous Buck Converter
AT1367A AIMTRON-AT1367A Datasheet
658Kb / 14P
   1MHz, 800mA Synchronous Buck Converter With Power Good Detector & LDO
logo
Monolithic Power System...
MP2105 MPS-MP2105 Datasheet
270Kb / 8P
   1MHz, 800mA Synchronous Step-Down Converter
MP2105 MPS-MP2105_06 Datasheet
285Kb / 8P
   1MHz, 800mA Synchronous Step-Down Converter
logo
Aimtron Technology
AT1361 AIMTRON-AT1361 Datasheet
204Kb / 15P
   1MHz,1A Synchronous Buck Converter
logo
Sipex Corporation
SP6654 SIPEX-SP6654_05 Datasheet
184Kb / 17P
   High Efficiency 800mA Synchronous Buck Regulator
logo
SHANGHAI BELLING CO., L...
BL8022 BELLING-BL8022 Datasheet
502Kb / 7P
   800mA 1.5MHz 7V Synchronous Buck Converter
logo
Renesas Technology Corp
ISL85418 RENESAS-ISL85418 Datasheet
1Mb / 21P
   Wide VIN 800mA Synchronous Buck Regulator
More results


Html Pages

1 2 3 4 5 6 7


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