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UC2843B PDF预览

UC2843B

更新时间： 2024-11-23 12:02:43
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 239K
描述
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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中文翻译

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UC2843B 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, DIP14,.3
针数：14Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.63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：12 V
标称输入电压：15 VJESD-30 代码：R-PDIP-T14
功能数量：1端子数量：14
最高工作温度：85 °C最低工作温度：-25 °C
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：DIP14,.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：5.1 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：OTHER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 mm
Base Number Matches：1

UC2843B 数据手册

 浏览型号UC2843B的Datasheet PDF文件第2页浏览型号UC2843B的Datasheet PDF文件第3页浏览型号UC2843B的Datasheet PDF文件第4页浏览型号UC2843B的Datasheet PDF文件第5页浏览型号UC2843B的Datasheet PDF文件第6页浏览型号UC2843B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  
comparatorwhich also providescurrentlimitcontrol,  
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.  
.
.
LOW START-UP AND OPERATING CURRENT  
.
Differences between members of this family are the  
under-voltage lockout thresholds and maximum duty  
cycle ranges. The UC3842B and UC3844B have  
UVLO thresholds of 16V (on) and 10V (off), ideally  
suited off-line applications The corresponding thresh-  
olds for the UC3843Band UC3845B are 8.5 Vand7.9  
V. The UC3842B and UC3843B can operate to duty  
cycles approaching 100%. A range of the zero to <  
50 % is obtained by the UC3844B and UC3845B by  
the addition of an internal toggle flip flop which blanks  
the output off every other clock cycle.  
DESCRIPTION  
The UC384xBfamilyofcontrol ICsprovidesthenec-  
essary 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-  
outfeaturing 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  
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  
March 1999  
1/15  
1234567...15

中文翻译

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UC2843B 替代型号

型号 品牌 替代类型 描述 数据表
UC3845G-S08-T UTC

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