поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

LM2733YMF-NOPB датащи(PDF) 9 Page - Texas Instruments

номер детали LM2733YMF-NOPB
подробное описание детали  LM2733 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

LM2733YMF-NOPB датащи(HTML) 9 Page - Texas Instruments

Back Button LM2733YMF-NOPB Datasheet HTML 5Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 6Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 7Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 8Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 9Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 10Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 11Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 12Page - Texas Instruments LM2733YMF-NOPB Datasheet HTML 13Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 22 page
background image
LM2733
www.ti.com
SNVS209E – NOVEMBER 2002 – REVISED APRIL 2013
Application Hints
SELECTING THE EXTERNAL CAPACITORS
The best capacitors for use with the LM2733 are multi-layer ceramic capacitors. They have the lowest ESR
(equivalent series resistance) and highest resonance frequency which makes them optimum for use with high
frequency switching converters.
When selecting a ceramic capacitor, only X5R and X7R dielectric types should be used. Other types such as
Z5U and Y5F have such severe loss of capacitance due to effects of temperature variation and applied voltage,
they may provide as little as 20% of rated capacitance in many typical applications. Always consult capacitor
manufacturer’s data curves before selecting a capacitor. High-quality ceramic capacitors can be obtained from
Taiyo-Yuden, AVX, and Murata.
SELECTING THE OUTPUT CAPACITOR
A single ceramic capacitor of value 4.7 µF to 10 µF will provide sufficient output capacitance for most
applications. For output voltages below 10V, a 10 µF capacitance is required. If larger amounts of capacitance
are desired for improved line support and transient response, tantalum capacitors can be used in parallel with the
ceramics. Aluminum electrolytics with ultra low ESR such as Sanyo Oscon can be used, but are usually
prohibitively expensive. Typical AI electrolytic capacitors are not suitable for switching frequencies above 500
kHz due to significant ringing and temperature rise due to self-heating from ripple current. An output capacitor
with excessive ESR can also reduce phase margin and cause instability.
SELECTING THE INPUT CAPACITOR
An input capacitor is required to serve as an energy reservoir for the current which must flow into the coil each
time the switch turns ON. This capacitor must have extremely low ESR, so ceramic is the best choice. We
recommend a nominal value of 2.2 µF, but larger values can be used. Since this capacitor reduces the amount of
voltage ripple seen at the input pin, it also reduces the amount of EMI passed back along that line to other
circuitry.
FEED-FORWARD COMPENSATION
Although internally compensated, the feed-forward capacitor Cf is required for stability (see Figure 26). Adding
this capacitor puts a zero in the loop response of the converter. Without it, the regulator loop can oscillate. The
recommended frequency for the zero fz should be approximately 8 kHz. Cf can be calculated using the formula:
Cf = 1 / (2 X
π X R1 X fz)
(1)
SELECTING DIODES
The external diode used in the typical application should be a Schottky diode. If the switch voltage is less than
15V, a 20V diode such as the MBR0520 is recommended. If the switch voltage is between 15V and 25V, a 30V
diode such as the MBR0530 is recommended. If the switch voltage exceeds 25V, a 40V diode such as the
MBR0540 should be used.
The MBR05XX series of diodes are designed to handle a maximum average current of 0.5A. For applications
exceeding 0.5A average but less than 1A, a Microsemi UPS5817 can be used.
LAYOUT HINTS
High frequency switching regulators require very careful layout of components in order to get stable operation
and low noise. All components must be as close as possible to the LM2733 device. It is recommended that a 4-
layer PCB be used so that internal ground planes are available.
As an example, a recommended layout of components is shown:
Copyright © 2002–2013, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Links: LM2733


Аналогичный номер детали - LM2733YMF-NOPB

производительномер деталидатащиподробное описание детали
logo
National Semiconductor ...
LM2733YMF NSC-LM2733YMF Datasheet
507Kb / 13P
   0.6/1.6 MHz Boost Converters With 40V Internal FET
LM2733YMF NSC-LM2733YMF Datasheet
406Kb / 16P
   0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
logo
Texas Instruments
LM2733YMF TI-LM2733YMF Datasheet
1Mb / 26P
[Old version datasheet]    0.6 and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23
LM2733YMF/NOPB TI-LM2733YMF/NOPB Datasheet
1Mb / 26P
[Old version datasheet]    0.6 and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23
logo
National Semiconductor ...
LM2733YMFX NSC-LM2733YMFX Datasheet
507Kb / 13P
   0.6/1.6 MHz Boost Converters With 40V Internal FET
More results

Аналогичное описание - LM2733YMF-NOPB

производительномер деталидатащиподробное описание детали
logo
National Semiconductor ...
LM2733 NSC-LM2733_07 Datasheet
406Kb / 16P
   0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
LM2731 NSC-LM2731 Datasheet
528Kb / 16P
   0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
LM2731 NSC-LM2731_07 Datasheet
432Kb / 16P
   0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
logo
Texas Instruments
LM2731 TI1-LM2731_14 Datasheet
1Mb / 22P
[Old version datasheet]   0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
LM2731XMF_NOPB TI1-LM2731XMF_NOPB Datasheet
667Kb / 16P
[Old version datasheet]   LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
LM2731 TI-LM2731_15 Datasheet
1Mb / 29P
[Old version datasheet]    0.6/1.6-MHz Boost Converters With 22-V Internal FET Switch in SOT-23
LM2731YMFX TI-LM2731YMFX Datasheet
629Kb / 16P
[Old version datasheet]   LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
logo
National Semiconductor ...
LM2733 NSC-LM2733 Datasheet
507Kb / 13P
   0.6/1.6 MHz Boost Converters With 40V Internal FET
logo
Texas Instruments
LM2733 TI-LM2733_15 Datasheet
1Mb / 26P
[Old version datasheet]    0.6 and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23
logo
National Semiconductor ...
LM27313 NSC-LM27313_07 Datasheet
337Kb / 12P
   1.6 MHz Boost Converter With 30V Internal FET Switch in SOT-23
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


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