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

X  

LT1977 数据表(PDF) 8 Page - Linear Technology

部件名 LT1977
功能描述  High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current
Download  24 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

LT1977 数据表(HTML) 8 Page - Linear Technology

Back Button LT1977 Datasheet HTML 4Page - Linear Technology LT1977 Datasheet HTML 5Page - Linear Technology LT1977 Datasheet HTML 6Page - Linear Technology LT1977 Datasheet HTML 7Page - Linear Technology LT1977 Datasheet HTML 8Page - Linear Technology LT1977 Datasheet HTML 9Page - Linear Technology LT1977 Datasheet HTML 10Page - Linear Technology LT1977 Datasheet HTML 11Page - Linear Technology LT1977 Datasheet HTML 12Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 24 page
background image
LT1977
8
1977f
BLOCK DIAGRA
12
FB
VC
Σ
15
INTERNAL REF
UNDERVOLTAGE
LOCKOUT
THERMAL
SHUTDOWN
SOFT-START
FOLDBACK
DETECT
SLOPE
COMP
ANTISLOPE
COMP
1.2V CT
CLAMP
2.4V
+
1.3V
1.25V
SHDN
9
CSS
14
SYNC
10
BIAS
4
VIN
SHDN
COMP
+
+
ERROR
AMP
11
13
PGFB
CT
1.12V
+
PG
COMP
7
BURST MODE
DETECT
500kHz
OSCILLATOR
SWITCH
LATCH
CURRENT
COMP
DRIVER
CIRCUITRY
R
Q
SW
S
2
BOOST
6
PG
16
GND 17
PGND
1977 BD
8
VC
CLAMP
The LT1977 is a constant frequency, current mode buck
converter. This means that there is an internal clock and two
feedback loops that control the duty cycle of the power
switch. In addition to the normal error amplifier, there is a
current sense amplifier that monitors switch current on a
cycle-by-cycle basis. A switch cycle starts with an oscilla-
tor pulse which sets the RS latch to turn the switch on. When
switch current reaches a level set by the current compara-
tor the latch is reset and the switch turns off. Output volt-
age control is obtained by using the output of the error
amplifier to set the switch current trip point. This technique
means that the error amplifier commands current to be
delivered to the output rather than voltage. A voltage fed
system will have low phase shift up to the resonant fre-
quency of the inductor and output capacitor, then an abrupt
180° shift will occur. The current fed system will have 90°
phase shift at a much lower frequency, but will not have the
additional 90° shift until well beyond the LC resonant fre-
quency. This makes it much easier to frequency compen-
sate the feedback loop and also gives much quicker tran-
sient response.
Most of the circuitry of the LT1977 operates from an
internal 2.4V bias line. The bias regulator normally draws
Figure 1. LT1977 Block Diagram


类似零件编号 - LT1977

制造商部件名数据表功能描述
logo
Linear Technology
LT1977 LINER-LT1977 Datasheet
350Kb / 30P
   Monolithic Dual Tracking 2A Step-Down Switching
LT1977 LINER-LT1977 Datasheet
207Kb / 20P
   True Color PWM Delivers Constant Color with 400:1 Dimming Range
LT1977 LINER-LT1977_15 Datasheet
331Kb / 24P
   High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100A Quiescent Current
More results

类似说明 - LT1977

制造商部件名数据表功能描述
logo
Linear Technology
LT1977 LINER-LT1977_15 Datasheet
331Kb / 24P
   High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100A Quiescent Current
LT3434 LINER-LT3434 Datasheet
367Kb / 24P
   High Voltage 3A, 200kHz Step-Down Switching Regulator with 100uA Quiescent Current
LT3437 LINER-LT3437 Datasheet
523Kb / 24P
   High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100uA Quiescent Current
LT3435 LINER-LT3435_15 Datasheet
325Kb / 24P
   High Voltage 3A, 500kHz Step-Down Switching Regulator with 100쨉A Quiescent Current
LT3435 LINER-LT3435 Datasheet
319Kb / 24P
   High Voltage 3A, 500kHz Step-Down Switching Regulator with 100짰 Quiescent Current
LT1976 LINER-LT1976_15 Datasheet
312Kb / 28P
   High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100A Quiescent Current
LT1976B LINER-LT1976B_15 Datasheet
312Kb / 28P
   High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100A Quiescent Current
LT1976 LINER-LT1976 Datasheet
797Kb / 24P
   High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100mA Quiescent Current
logo
National Semiconductor ...
LM1572 NSC-LM1572 Datasheet
584Kb / 17P
   1.5A, 500kHz Step-down Voltage Regulator
logo
Linear Technology
LT1956-5 LINER-LT1956-5_15 Datasheet
314Kb / 28P
   High Voltage, 1.5A, 500kHz Step-Down Switching Regulators
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


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