数据搜索系统,热门电子元器件搜索
  Chinese  ▼

Delete All
ON OFF
ALLDATASHEETCN.COM

X  

预览 PDF Download HTML

LT1931 数据表(PDF) 4 Page - Linear Technology

部件名 LT1931
功能描述  1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1931 数据表(HTML) 4 Page - Linear Technology

  LT1931 Datasheet HTML 1Page - Linear Technology LT1931 Datasheet HTML 2Page - Linear Technology LT1931 Datasheet HTML 3Page - Linear Technology LT1931 Datasheet HTML 4Page - Linear Technology LT1931 Datasheet HTML 5Page - Linear Technology LT1931 Datasheet HTML 6Page - Linear Technology LT1931 Datasheet HTML 7Page - Linear Technology LT1931 Datasheet HTML 8Page - Linear Technology LT1931 Datasheet HTML 9Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 12 page
background image
4
LT1931/LT1931A
1931fa
BLOCK DIAGRA
Figure 2
OPERATIO
The LT1931 uses a constant frequency, current mode
control scheme to provide excellent line and load regula-
tion. Operation can be best understood by referring to the
Block Diagram in Figure 2. At the start of each oscillator
cycle, the SR latch is set, turning on the power switch Q3.
A voltage proportional to the switch current is added to a
stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator A2. When this
voltage exceeds the level at the negative input of A2, the SR
latch is reset, turning off the power switch. The level at the
negative input of A2 is set by the error amplifier (gm) and
is simply an amplified version of the difference between
the feedback voltage and the reference voltage of –1.255V.
In this manner, the error amplifier sets the correct peak
current level to keep the output in regulation. If the error
amplifier’s output increases, more current is taken from
the output; if it decreases, less current is taken. One
function not shown in Figure 2 is the current limit. The
switch current is constantly monitored and not allowed to
exceed the nominal value of 1.2A. If the switch current
reaches 1.2A, the SR latch is reset regardless of the state
of comparator A2. This current limit protects the power
switch as well as various external components connected
to the LT1931.
The Block Diagram for the LT1931A is identical except that
the oscillator is 2.2MHz and resistors R3 to R6 are one-half
the LT1931 values.
+
LATCH
RQ
S
0.01
SW
DRIVER
COMPARATOR
2
SHUTDOWN
SHDN
4
1
+
Σ
RAMP
GENERATOR
RC
CC
1.2MHz
OSCILLATOR
GND
1931 BD
R6
80k
R4
150k
R3
30k
Q2
x10
Q1
Q3
R5
80k
VIN
VIN 5
NFB
CPL
(OPTIONAL)
R2
(EXTERNAL)
R1
(EXTERNAL)
VOUT
NFB
3
A2
A1
gm


类似零件编号 - LT1931

制造商部件名数据表功能描述
Linear Technology
Linear Technology
LT1931 LINER-LT1931 Datasheet
212Kb / 12P
   1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931 LINER-LT1931 Datasheet
274Kb / 28P
   Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization
LT1931 LINER-LT1931 Datasheet
477Kb / 36P
   Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller
LT1931 LINER-LT1931 Datasheet
454Kb / 12P
   1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931 LINER-LT1931 Datasheet
193Kb / 12P
   Low Dropout Negative Micropower Regulator in ThinSOT
More results

类似说明 - LT1931

制造商部件名数据表功能描述
Linear Technology
Linear Technology
LT1931 LINER-LT1931 Datasheet
212Kb / 12P
   1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931 LINER-LT1931_15 Datasheet
454Kb / 12P
   1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931A LINER-LT1931A_15 Datasheet
454Kb / 12P
   1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1930A LINER-LT1930A_15 Datasheet
202Kb / 12P
   1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT
LT1930 LINER-LT1930_15 Datasheet
202Kb / 12P
   1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT
LT3462 LINER-LT3462_15 Datasheet
233Kb / 8P
   Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
LT3462A LINER-LT3462A_15 Datasheet
233Kb / 8P
   Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
LT3462 LINER-LT3462 Datasheet
225Kb / 8P
   Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
LT1930 LINER-LT1930 Datasheet
190Kb / 12P
   1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters
LTC3527 LINER-LTC3527 Datasheet
2Mb / 20P
   Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters
More results


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


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