Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

LM2734 Scheda tecnica(PDF) 9 Page - Texas Instruments

Click here to check the latest version.
Il numero della parte LM2734
Spiegazioni elettronici  LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
Download  31 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

LM2734 Scheda tecnica(HTML) 9 Page - Texas Instruments

Back Button LM2734 Datasheet HTML 5Page - Texas Instruments LM2734 Datasheet HTML 6Page - Texas Instruments LM2734 Datasheet HTML 7Page - Texas Instruments LM2734 Datasheet HTML 8Page - Texas Instruments LM2734 Datasheet HTML 9Page - Texas Instruments LM2734 Datasheet HTML 10Page - Texas Instruments LM2734 Datasheet HTML 11Page - Texas Instruments LM2734 Datasheet HTML 12Page - Texas Instruments LM2734 Datasheet HTML 13Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 31 page
background image
0
0
VIN
VD
TON
t
t
Inductor
Current
D = TON/TSW
VSW
TOFF
TSW
IL
IPK
SW
Voltage
LM2734
www.ti.com
SNVS288I – SEPTEMBER 2004 – REVISED APRIIL 2013
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 compensated, 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 22) and to
the waveforms in Figure 23. 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 (VSW) swings up to approximately VIN, and
the inductor current (IL) increases with a linear slope. IL 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 amplifier’s output, which is proportional to the difference between the
feedback voltage and VREF. 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 (VD) of the catch diode. The regulator
loop adjusts the duty cycle (D) to maintain a constant output voltage.
Figure 23. LM2734 Waveforms of SW Pin Voltage and Inductor Current
BOOST FUNCTION
Capacitor CBOOST and diode D2 in Figure 24 are used to generate a voltage VBOOST. VBOOST - VSW is the gate
drive voltage to the internal NMOS control switch. To properly drive the internal NMOS switch during its on-time,
VBOOST needs to be at least 1.6V greater than VSW. Although the LM2734 will operate with this minimum voltage,
it may not have sufficient gate drive to supply large values of output current. Therefore, it is recommended that
VBOOST be greater than 2.5V above VSW for best efficiency. VBOOST – VSW should not exceed the maximum
operating limit of 5.5V.
5.5V > VBOOST – VSW > 2.5V for best performance.
Copyright © 2004–2013, Texas Instruments Incorporated
Submit Documentation Feedback
9
Product Folder Links: LM2734


Codice articolo simile - LM2734

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
National Semiconductor ...
LM2734 NSC-LM2734 Datasheet
459Kb / 22P
   Thin SOT23 1A Load Step-Down DC-DC Regulator
logo
Texas Instruments
LM2734 TI1-LM2734 Datasheet
1Mb / 36P
[Old version datasheet]   Thin SOT 1-A Load Step-Down DC-DC Regulator
LM2734-Q1 TI1-LM2734-Q1 Datasheet
1Mb / 36P
[Old version datasheet]   Thin SOT 1-A Load Step-Down DC-DC Regulator
logo
National Semiconductor ...
LM27341 NSC-LM27341 Datasheet
717Kb / 30P
   2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
logo
Texas Instruments
LM27341 TI1-LM27341 Datasheet
1Mb / 42P
[Old version datasheet]   2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
More results

Descrizione simile - LM2734

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Texas Instruments
LM2734 TI-LM2734_15 Datasheet
1Mb / 37P
[Old version datasheet]   LM2734 Thin SOT 1-A 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
logo
National Semiconductor ...
LM2734 NSC-LM2734 Datasheet
459Kb / 22P
   Thin SOT23 1A Load Step-Down DC-DC Regulator
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
LM2734Z TI1-LM2734Z_16 Datasheet
1Mb / 36P
[Old version datasheet]   Thin SOT 1-A 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
LM2736YMK TI-LM2736YMK Datasheet
1Mb / 31P
[Old version datasheet]   LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator
LM2736XMK TI1-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 23 24 25 26 27 28 29 30 31


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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