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UC2844N PDF预览

UC2844N

更新时间: 2024-11-04 04:48:19
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
11页 100K
描述
CURRENTMODE PWM CONTROLLER

UC2844N 技术参数

是否Rohs认证:不符合生命周期:Obsolete
零件包装代码:DIP包装说明:0.300 INCH, MINI, DIP-8
针数:8Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.69Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:25 V
最小输入电压:15 V标称输入电压:15 V
JESD-30 代码:R-PDIP-T8JESD-609代码:e0
功能数量:1端子数量:8
最高工作温度:85 °C最低工作温度:-25 °C
最大输出电流:1 A标称输出电压:2.5 V
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装等效代码:DIP8,.3封装形状:RECTANGULAR
封装形式:IN-LINE峰值回流温度(摄氏度):NOT SPECIFIED
认证状态:Not Qualified座面最大高度:4.8 mm
子类别:Switching Regulator or Controllers最大供电电流 (Isup):20 mA
表面贴装:NO切换器配置:SINGLE
最大切换频率:500 kHz技术:BIPOLAR
温度等级:OTHER端子面层:Tin/Lead (Sn/Pb)
端子形式:THROUGH-HOLE端子节距:2.54 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:7.62 mmBase Number Matches:1

UC2844N 数据手册

 浏览型号UC2844N的Datasheet PDF文件第2页浏览型号UC2844N的Datasheet PDF文件第3页浏览型号UC2844N的Datasheet PDF文件第4页浏览型号UC2844N的Datasheet PDF文件第5页浏览型号UC2844N的Datasheet PDF文件第6页浏览型号UC2844N的Datasheet PDF文件第7页 
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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