数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

LM3674 数据表(PDF) 10 Page - Texas Instruments

部件名 LM3674
功能描述  LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM3674 数据表(HTML) 10 Page - Texas Instruments

Back Button LM3674_15 Datasheet HTML 6Page - Texas Instruments LM3674_15 Datasheet HTML 7Page - Texas Instruments LM3674_15 Datasheet HTML 8Page - Texas Instruments LM3674_15 Datasheet HTML 9Page - Texas Instruments LM3674_15 Datasheet HTML 10Page - Texas Instruments LM3674_15 Datasheet HTML 11Page - Texas Instruments LM3674_15 Datasheet HTML 12Page - Texas Instruments LM3674_15 Datasheet HTML 13Page - Texas Instruments LM3674_15 Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 26 page
background image
VOUT
TIME (200 ns/DIV)
200 mA/DIV
IL
VSW
2V/DIV
10 mV/DIV
AC Coupled
VIN = 3.6V
VOUT = 1.5V
IOUT = 400 mA
-VOUT
L
VIN-VOUT
L
LM3674
SNVS405G – DECEMBER 2005 – REVISED APRIL 2015
www.ti.com
7.3 Feature Description
7.3.1 Circuit Operation
During the first portion of each switching cycle, the control block in the LM3674 turns on the internal PFET
switch. This allows current to flow from the input through the inductor to the output filter capacitor and load. The
inductor limits the current to a ramp with a slope of:
(1)
by storing energy in a magnetic field. During the second portion of each cycle, the controller turns the PFET
switch off, blocking current flow from the input, and then turns the NFET synchronous rectifier on. The inductor
draws current from ground through the NFET to the output filter capacitor and load, which ramps the inductor
current down with a slope of:
(2)
The output filter stores charge when the inductor current is high, and releases it when the inductor current is low,
smoothing the voltage across the load.
The output voltage is regulated by modulating the PFET switch-on time to control the average current sent to the
load. The effect is identical to sending a duty-cycle modulated rectangular wave formed by the switch and
synchronous rectifier at the SW pin to a low-pass filter formed by the inductor and output filter capacitor. The
output voltage is equal to the average voltage at the SW pin.
7.3.2 PWM Operation
During PWM operation, the converter operates as a voltage-mode controller with input voltage feed-forward. This
allows the converter to achieve excellent load and line regulation. The DC gain of the power stage is proportional
to the input voltage. To eliminate this dependence, feed-forward inversely proportional to the input voltage is
introduced.
While in PWM mode, the output voltage is regulated by switching at a constant frequency and then modulating
the energy per cycle to control power to the load. At the beginning of each clock cycle, the PFET switch is turned
on and the inductor current ramps up until the comparator trips and the control logic turns off the switch.
The current limit comparator can also turn off the switch in case the current limit of the PFET is exceeded. Then
the NFET switch is turned on and the inductor current ramps down. The next cycle is initiated by the clock
turning off the NFET and turning on the PFET.
Figure 18. PWM Operation
10
Submit Documentation Feedback
Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: LM3674


类似零件编号 - LM3674_15

制造商部件名数据表功能描述
logo
Texas Instruments
LM3674 TI1-LM3674_14 Datasheet
4Mb / 22P
[Old version datasheet]   2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5
More results

类似说明 - LM3674_15

制造商部件名数据表功能描述
logo
Texas Instruments
LM3674 TI1-LM3674 Datasheet
4Mb / 25P
[Old version datasheet]   LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT-23
logo
Linear Technology
LTC1701 LINER-LTC1701 Datasheet
138Kb / 12P
   1MHz Step-Down DC/DC Converter in SOT-23
logo
ON Semiconductor
NCP1522B ONSEMI-NCP1522B_10 Datasheet
191Kb / 14P
   3 MHz, 600 mA Step-Down DC-DC Converter
December, 2010 ??Rev. 1
NCP1521B ONSEMI-NCP1521B_10 Datasheet
187Kb / 14P
   1.5 MHz, 600 mA Step-Down DC-DC Converter
December, 2010 ??Rev. 5
NCP1522B ONSEMI-NCP1522B Datasheet
206Kb / 14P
   3 MHz, 600 mA Step-Down DC-DC Converter
May, 2007 - Rev. 0
logo
Texas Instruments
LM3676 TI-LM3676_15 Datasheet
3Mb / 25P
[Old version datasheet]   2-MHz 600-mA Step-Down DC-DC Converter With Mode Control
LM3673 TI-LM3673_15 Datasheet
4Mb / 28P
[Old version datasheet]   2-MHz, 350-mA Step-Down DC-DC Converter
LM2840 TI1-LM2840 Datasheet
271Kb / 15P
[Old version datasheet]   100/300/600 mA 42V Input Step-Down DC/DC Regulator in Thin SOT-23
logo
Zilog, Inc.
IXD3235 ZILOG-IXD3235 Datasheet
2Mb / 27P
   Synchronous 600 mA Step-Down DC/DC Converter
logo
National Semiconductor ...
LM2841 NSC-LM2841 Datasheet
324Kb / 14P
   300 mA/600 mA up to 42V Input Step-Down DC/DC Regulator in Thin 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 23 24 25 26


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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