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UC3844D PDF预览

UC3844D

更新时间： 2024-11-22 22:59:31
品牌 Logo 应用领域
德州仪器 - TI 开关光电二极管控制器
页数 文件大小 规格书
19页 934K
描述
Current Mode PWM Controller

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中文翻译

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UC3844D 数据手册

 浏览型号UC3844D的Datasheet PDF文件第2页浏览型号UC3844D的Datasheet PDF文件第3页浏览型号UC3844D的Datasheet PDF文件第4页浏览型号UC3844D的Datasheet PDF文件第5页浏览型号UC3844D的Datasheet PDF文件第6页浏览型号UC3844D的Datasheet PDF文件第7页 
UC1842/3/4/5  
UC2842/3/4/5  
UC3842/3/4/5  
Current Mode PWM Controller  
FEATURES  
DESCRIPTION  
•
Optimized For Off-line And DC  
To DC Converters  
The UC1842/3/4/5 family of control ICs provides the necessary features to  
implement off-line or DC to DC fixed frequency current mode control schemes  
with a minimal external parts count. Internally implemented circuits include  
under-voltage lockout featuring start up current less than 1mA, a precision  
reference trimmed for accuracy at the error amp input, logic to insure latched  
operation, a PWM comparator which also provides current limit control, 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 Current (<1mA)  
Automatic Feed Forward  
Compensation  
•
•
Pulse-by-pulse Current Limiting  
Enhanced Load Response  
Characteristics  
Differences between members of this family are the under-voltage lockout  
thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have  
UVLO thresholds of 16V (on) and 10V (off), ideally suited to off-line  
applications. The corresponding thresholds for the UC1843 and UC1845 are  
8.4V and 7.6V. The UC1842 and UC1843 can operate to duty cycles  
approaching 100%. A range of zero to 50% is obtained by the UC1844 and  
UC1845 by the addition of an internal toggle flip flop which blanks the output  
off every other clock cycle.  
•
Under-voltage Lockout With  
Hysteresis  
•
•
Double Pulse Suppression  
High Current Totem Pole  
Output  
•
Internally Trimmed Bandgap  
Reference  
•
•
500khz Operation  
Low RO Error Amp  
BLOCK DIAGRAM  
A/B  
Note 1:  
Note 2:  
A = DIL-8 Pin Number. B = SO-14 and CFP-14 Pin Number.  
Toggle flip flop used only in 1844 and 1845.  
SLUS223A - APRIL 1997 - REVISED MAY 2002  
1234567...19

中文翻译

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UC3844D 替代型号

型号 品牌 替代类型 描述 数据表
UC3844DG4 TI

完全替代

 CURRENT MODE PWM CONTROLLER
UC2842D TI

完全替代

 Current Mode PWM Controller
UC3842D TI

完全替代

 Current Mode PWM Controller

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