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

X  

UC3842T 数据表(PDF) 1 Page - STMicroelectronics

部件名 UC3842T
功能描述  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Download  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

UC3842T 数据表(HTML) 1 Page - STMicroelectronics

  UC3842T Datasheet HTML 1Page - STMicroelectronics UC3842T Datasheet HTML 2Page - STMicroelectronics UC3842T Datasheet HTML 3Page - STMicroelectronics UC3842T Datasheet HTML 4Page - STMicroelectronics UC3842T Datasheet HTML 5Page - STMicroelectronics UC3842T Datasheet HTML 6Page - STMicroelectronics UC3842T Datasheet HTML 7Page - STMicroelectronics UC3842T Datasheet HTML 8Page - STMicroelectronics UC3842T Datasheet HTML 9Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 1 / 15 page
background image
UC3842T UC3843T
UC3844T UC3845T
September 2001
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
.
TRIMMED OSCILLATOR FOR PRECISE FRE-
QUENCY CONTROL
.
OSCILLATOR FREQUENCY GUARANTEED
AT 250kHz
.
CURRENT MODE OPERATION TO 500kHz
.
AUTOMATIC FEED FORWARD COMPENSA-
TION
.
LATCHING PWM FOR CYCLE-BY-CYCLE
CURRENT LIMITING
.
INTERNALLY TRIMMED REFERENCE WITH
UNDERVOLTAGE LOCKOUT
.
HIGH CURRENT TOTEM POLE OUTPUT
.
UNDERVOLTAGE LOCKOUT WITH HYSTER-
ESIS
.
LOW START-UP AND OPERATING CURRENT
DESCRIPTION
The UC384XT family of control ICs provides the
necessary features to implement off-line or DC to
DC fixed frequency current mode control schemes
with a minimal external parts count. Internally imple-
mented circuits include a trimmed oscillator for pre-
cise DUTY CYCLE CONTROL under voltage lock-
out featuring start-up current less than 0.5mA, a pre-
cision reference trimmed for accuracy at the error
amp input, logic to insure latched operation, a PWM
comparator which also provides current limit control,
and a totem pole output stage designed to source
or sink high peak current. The output stage, suitable
for driving N-Channel MOSFETs, is low in the off-
state.
Differences between members of this family are the
under-voltage lockout thresholds and maximum duty
cycle ranges. The UC3842T and UC3844T have
UVLO thresholds of 16V (on) and 10V (off), ideally
suited to off-line applications The corresponding
thresholds for the UC3843T and UC3845T are 8.5 V
and 7.9 V. The UC3842T and UC3843T can operate
to duty cycles approaching 100%. A range of zero to
< 50 % is obtained by the UC3844T and UC3845T by
the addition of an internal toggle flip flop which blanks
the output off every other clock cycle.
BLOCK DIAGRAM (toggle flip flop used only in UC3844T and UC3845T)
UVLO
S/R
5V
REF
34V
INTERNAL
BIAS
VREF GOOD
LOGIC
2.50V
T
S
R
OSC
R1V
CURRENT
SENSE
COMPARATOR
2R
+
-
PWM
LATCH
7
5
4
2
1
3
8
6
ERROR AMP.
Vi
GROUND
RT/CT
VFB
COMP
CURRENT
SENSE
VREF
5V 50mA
OUTPUT
D95IN331
Minidip
®
SO8
1/15


类似零件编号 - UC3842T

制造商部件名数据表功能描述
logo
NXP Semiconductors
UC3842 PHILIPS-UC3842 Datasheet
74Kb / 8P
   Current-mode PWM controller
August 31, 1994
logo
Texas Instruments
UC3842 TI-UC3842 Datasheet
693Kb / 28P
[Old version datasheet]   CURRENT MODE PWM CONTROLLER
logo
STMicroelectronics
UC3842 STMICROELECTRONICS-UC3842 Datasheet
96Kb / 11P
   CURRENTMODE PWM CONTROLLER
logo
Texas Instruments
UC3842 TI-UC3842 Datasheet
693Kb / 28P
[Old version datasheet]   CURRENT MODE PWM CONTROLLER
logo
STMicroelectronics
UC3842 STMICROELECTRONICS-UC3842 Datasheet
129Kb / 15P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
More results

类似说明 - UC3842T

制造商部件名数据表功能描述
logo
STMicroelectronics
UC2842B STMICROELECTRONICS-UC2842B Datasheet
135Kb / 15P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3842B STMICROELECTRONICS-UC3842B Datasheet
135Kb / 15P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC2842A STMICROELECTRONICS-UC2842A Datasheet
167Kb / 16P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3844BD1013TR STMICROELECTRONICS-UC3844BD1013TR Datasheet
239Kb / 15P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
UC3845BD1013TR STMICROELECTRONICS-UC3845BD1013TR Datasheet
239Kb / 15P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
E-UC3843BD1 STMICROELECTRONICS-E-UC3843BD1 Datasheet
239Kb / 15P
   HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
logo
Holtek Semiconductor In...
HT7A3942 HOLTEK-HT7A3942 Datasheet
1Mb / 11P
   High Performance Current Mode PWM Controller
logo
Semtech Corporation
SC4809A SEMTECH-SC4809A_16 Datasheet
321Kb / 16P
   High Performance Current Mode PWM Controller
logo
Texas Instruments
TL2843B-Q1 TI-TL2843B-Q1_15 Datasheet
286Kb / 18P
[Old version datasheet]   HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER
logo
List of Unclassifed Man...
M5576 ETC-M5576 Datasheet
686Kb / 10P
   High performance current mode PWM controller
V1.0
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


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