поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

LM2734YMKX датащи(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM2734YMKX
подробное описание детали  Thin SOT23 1A Load Step-Down DC-DC Regulator
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2734YMKX датащи(HTML) 7 Page - National Semiconductor (TI)

Back Button LM2734YMKX Datasheet HTML 3Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 4Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 5Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 6Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 7Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 8Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 9Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 10Page - National Semiconductor (TI) LM2734YMKX Datasheet HTML 11Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 22 page
background image
Application Information
THEORY OF OPERATION
The LM2734 is a constant frequency PWM buck regulator IC
that delivers a 1A load current. The regulator has a preset
switching frequency of either 550kHz (LM2734Y) or 1.6MHz
(LM2734X). These high frequencies allow the LM2734 to
operate with small surface mount capacitors and inductors,
resulting in DC/DC converters that require a minimum
amount of board space. The LM2734 is internally compen-
sated, so it is simple to use, and requires few external
components. The LM2734 uses current-mode control to
regulate the output voltage.
The following operating description of the LM2734 will refer
to the Simplified Block Diagram (Figure 1) and to the wave-
forms in Figure 2. The LM2734 supplies a regulated output
voltage by switching the internal NMOS control switch at
constant frequency and variable duty cycle. A switching
cycle begins at the falling edge of the reset pulse generated
by the internal oscillator. When this pulse goes low, the
output control logic turns on the internal NMOS control
switch. During this on-time, the SW pin voltage (V
SW) swings
up to approximately V
IN, and the inductor current (IL) in-
creases with a linear slope. I
L is measured by the current-
sense amplifier, which generates an output proportional to
the switch current. The sense signal is summed with the
regulator’s corrective ramp and compared to the error am-
plifier’s output, which is proportional to the difference be-
tween the feedback voltage and V
REF. When the PWM
comparator output goes high, the output switch turns off until
the next switching cycle begins. During the switch off-time,
inductor current discharges through Schottky diode D1,
which forces the SW pin to swing below ground by the
forward voltage (V
D) of the catch diode. The regulator loop
adjusts the duty cycle (D) to maintain a constant output
voltage.
BOOST FUNCTION
Capacitor C
BOOST and diode D2 in Figure 3 are used to
generate a voltage V
BOOST.VBOOST -VSW is the gate drive
voltage to the internal NMOS control switch. To properly
drive the internal NMOS switch during its on-time, V
BOOST
needs to be at least 1.6V greater than V
SW. Although the
LM2734 will operate with this minimum voltage, it may not
have sufficient gate drive to supply large values of output
Block Diagram
20102306
FIGURE 1.
20102307
FIGURE 2. LM2734 Waveforms of SW Pin Voltage and
Inductor Current
www.national.com
7


Аналогичный номер детали - LM2734YMKX

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
LM2734YMKX TI1-LM2734YMKX Datasheet
1Mb / 31P
[Old version datasheet]   LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
LM2734YMKX/NOPB TI1-LM2734YMKX/NOPB Datasheet
1Mb / 31P
[Old version datasheet]   LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
LM2734YMKX/NOPB TI1-LM2734YMKX/NOPB Datasheet
1Mb / 36P
[Old version datasheet]   Thin SOT 1-A Load Step-Down DC-DC Regulator
More results

Аналогичное описание - LM2734YMKX

производительномер деталидатащиподробное описание детали
logo
National Semiconductor ...
LM2734Z NSC-LM2734Z Datasheet
775Kb / 9P
   Thin SOT23 1A Load Step-Down DC-DC Regulator
logo
Texas Instruments
LM2734Z TI1-LM2734Z_14 Datasheet
1Mb / 29P
[Old version datasheet]   Thin SOT23 1A Load Step-Down DC-DC Regulator
logo
National Semiconductor ...
LM2736 NSC-LM2736 Datasheet
444Kb / 22P
   Thin SOT23 750mA Load Step-Down DC-DC Regulator
logo
Texas Instruments
LM2736 TI1-LM2736_14 Datasheet
1Mb / 27P
[Old version datasheet]   Thin SOT23 750mA Load Step-Down DC-DC Regulator
LMR12007 TI1-LMR12007 Datasheet
1Mb / 30P
[Old version datasheet]   LMR12007 Thin SOT23 750mA Load Step-Down DC-DC Regulator
LMR12007 TI1-LMR12007 Datasheet
1Mb / 30P
[Old version datasheet]   LMR12007 Thin SOT23 750mA Load Step-Down DC-DC Regulator
LM2734 TI1-LM2734 Datasheet
1Mb / 31P
[Old version datasheet]   LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
LM2734Z TI-LM2734Z_15 Datasheet
1Mb / 32P
[Old version datasheet]   LM2734Z/LM2734ZQ Thin SOT 1A Load Step-Down DC-DC Regulator
LM2736YMKX TI-LM2736YMKX Datasheet
1Mb / 31P
[Old version datasheet]   LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator
LM2736XMK TI-LM2736XMK Datasheet
1Mb / 31P
[Old version datasheet]   LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator
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