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UC3842AD1 PDF预览

UC3842AD1

更新时间: 2024-11-04 22:11:27
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 控制器
页数 文件大小 规格书
15页 131K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

UC3842AD1 数据手册

 浏览型号UC3842AD1的Datasheet PDF文件第2页浏览型号UC3842AD1的Datasheet PDF文件第3页浏览型号UC3842AD1的Datasheet PDF文件第4页浏览型号UC3842AD1的Datasheet PDF文件第5页浏览型号UC3842AD1的Datasheet PDF文件第6页浏览型号UC3842AD1的Datasheet PDF文件第7页 
UC2842A/3A/4A/5A  
UC3842A/3A/4A/5A  
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER  
TRIMMED OSCILLATOR DISCHARGE CUR-  
RENT  
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  
.
Minidip  
SO8  
.
.
.
comparatorwhichalsoprovidescurrentlimitcontrol,  
and a totem pole output stage designed to source  
orsinkhighpeakcurrent.Theoutputstage,suitable  
for driving N-Channel MOSFETs, is low in the off-  
state.  
LOW START-UP CURRENT (< 0.5mA)  
DOUBLE PULSE SUPPRESSION  
.
.
Differencesbetween members of this family are the  
under-voltagelockoutthresholdsandmaximum duty  
cycle ranges. The UC3842A and UC3844A have  
UVLO thresholds of 16V (on) and 10V (off), ideally  
suitedoff-lineapplicationsThecorrespondingthresh-  
olds for the UC3843A and UC3845A are 8.5 V and  
7.9V. The UC3842A and UC3843A can operate to  
dutycyclesapproaching100%.Arangeofthezeroto  
<50%is obtainedbytheUC3844AandUC3845Aby  
theadditionofan internaltoggleflipflopwhichblanks  
theoutputoff everyotherclock cycle.  
DESCRIPTION  
TheUC384xAfamilyofcontrolICsprovidesthenec-  
essary features to implement off-line or DC to DC  
fixedfrequencycurrent modecontrol schemes with  
a minimal external parts count. Internally imple-  
mentedcircuits includea trimmed oscillator for pre-  
cise DUTY CYCLE CONTROL under voltagelock-  
outfeaturingstart-upcurrentlessthan0.5mA,a pre-  
cision reference trimmed for accuracy at the error  
ampinput,logicto insurelatchedoperation,a PWM  
BLOCK DIAGRAM (toggle flip flop used only in UC3844A and UC3845A)  
7
Vi  
UVLO  
34V  
8
6
5V  
REF  
VREF  
5V 50mA  
5
S/R  
GROUND  
INTERNAL  
BIAS  
2.50V  
VREF GOOD  
LOGIC  
OUTPUT  
4
RT/CT  
OSC  
ERROR AMP.  
T
2R  
+
-
S
2
1
3
VFB  
R
PWM  
LATCH  
R
1V  
COMP  
CURRENT  
SENSE  
CURRENT  
SENSE  
COMPARATOR  
UC3842A  
D95IN331  
1/15  
March 1999  

UC3842AD1 替代型号

型号 品牌 替代类型 描述 数据表
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