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UC2845

更新时间: 2024-11-23 07:05:27
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
11页 100K
描述
CURRENTMODE PWM CONTROLLER

UC2845 数据手册

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UC2842/3/4/5  
UC3842/3/4/5  
CURRENT MODE PWM CONTROLLER  
OPTIMIZED FOR OFF-LINE AND DC TO DC  
CONVERTERS  
.
LOW START-UP CURRENT (< 1 mA)  
AUTOMATIC FEED FORWARD COMPENSA-  
TION  
PULSE-BY-PULSECURRENT LIMITING  
ENHANCED LOAD RESPONSE CHARAC-  
TERISTICS  
UNDER-VOLTAGELOCKOUTWITHHYSTER-  
ESIS  
DOUBLE PULSE SUPPRESSION  
HIGH CURRENT TOTEM POLE OUTPUT  
INTERNALLY TRIMMED BANDGAP REFER-  
ENCE  
.
.
.
.
SO14  
Minidip  
.
.
.
.
logicto insure latchedoperation,a PWM compara-  
torwhichalsoprovidescurrentlimitcontrol,andato-  
tem pole output stage designed to source or sink  
high peak current. The output stage, suitable for  
drivingN-ChannelMOSFETs,islow intheoff-state.  
500 KHz OPERATION  
.
.
LOW R ERRORAMP  
O
Differencesbetweenmembersof this familyarethe  
under-voltage lockout thresholds and maximum  
duty cycle ranges. The UC3842 and UC3844 have  
UVLO thresholds of 16V (on) and 10V (off), ideally  
suited off-line applications The corresponding  
thresholds for the UC3843 and UC3845 are 8.5 V  
and 7.9 V. The UC3842 and UC3843 can operate  
to duty cycles approaching 100%. A range of the  
zero to < 50 % is obtained by the UC3844 and  
UC3845by theadditionof aninternaltoggleflip flop  
which blanksthe outputoff every otherclock cycle.  
DESCRIPTION  
TheUC3842/3/4/5family ofcontrolICsprovidesthe  
necessary features to implement off-line or DC to  
DC fixed frequency current mode controlschemes  
witha minimalexternalpartscount.Internallyimple-  
mentedcircuitsincludeundervoltagelockoutfeatur-  
ing start-up current less than 1 mA, a precisionref-  
erencetrimmed foraccuracyat theerroramp input,  
BLOCK DIAGRAM (toggle flip flop used only in U3844 and UC3845)  
1/11  
October 1998  

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