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UC3845BN PDF预览

UC3845BN

更新时间: 2024-11-21 22:59:31
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 开关光电二极管控制器
页数 文件大小 规格书
15页 137K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

UC3845BN 技术参数

是否Rohs认证: 符合生命周期:Active
零件包装代码:DIP包装说明:DIP, DIP8,.3
针数:8Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
Factory Lead Time:10 weeks风险等级:0.81
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:30 V
最小输入电压:8.2 V标称输入电压:15 V
JESD-30 代码:R-PDIP-T8JESD-609代码:e3
功能数量:1端子数量:8
最高工作温度:70 °C最低工作温度:
最大输出电流:1 A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:5.08 mm子类别:Switching Regulator or Controllers
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:COMMERCIAL端子面层:Matte Tin (Sn) - annealed
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

UC3845BN 数据手册

 浏览型号UC3845BN的Datasheet PDF文件第2页浏览型号UC3845BN的Datasheet PDF文件第3页浏览型号UC3845BN的Datasheet PDF文件第4页浏览型号UC3845BN的Datasheet PDF文件第5页浏览型号UC3845BN的Datasheet PDF文件第6页浏览型号UC3845BN的Datasheet PDF文件第7页 
UC2842B/3B/4B/5B  
UC3842B/3B/4B/5B  
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  
.
.
.
.
Minidip  
SO8  
LATCHING PWM FOR CYCLE-BY-CYCLE  
CURRENT LIMITING  
.
.
INTERNALLY TRIMMED REFERENCE WITH  
UNDERVOLTAGE LOCKOUT  
HIGH CURRENT TOTEM POLE OUTPUT  
UNDERVOLTAGE LOCKOUT WITH HYSTER-  
ESIS  
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-UPAND OPERATINGCURRENT  
.
Differencesbetween members of this family are the  
under-voltagelockoutthresholdsandmaximum duty  
cycle ranges. The UC3842B and UC3844B have  
UVLO thresholds of 16V (on) and 10V (off), ideally  
suitedoff-lineapplicationsThecorrespondingthresh-  
oldsfortheUC3843BandUC3845Bare8.5Vand7.9  
V. The UC3842B and UC3843B can operateto duty  
cycles approaching100%. A range of the zero to <  
50 % is obtainedby the UC3844Band UC3845Bby  
theadditionofan internaltoggleflipflopwhichblanks  
theoutputoff everyotherclock cycle.  
DESCRIPTION  
TheUC384xBfamilyofcontrolICsprovidesthenec-  
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 UC3844B and UC3845B)  
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  
UC3842B  
CURRENT  
SENSE  
COMPARATOR  
D95IN331  
1/15  
March 1999  

UC3845BN 替代型号

型号 品牌 替代类型 描述 数据表
LT1244CS8#PBF Linear

类似代替

LT1244 - High Speed Current Mode Pulse Width Modulators; Package: SO; Pins: 8; Temperature
UC2843BD1 STMICROELECTRONICS

类似代替

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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