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UC3844AD

更新时间： 2024-02-19 06:16:05
品牌 Logo 应用领域
美高森美 - MICROSEMI 稳压器开关式稳压器或控制器电源电路开关式控制器
页数 文件大小 规格书
8页 229K
描述
CURRENT MODE PWM CONTROLLER

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UC3844AD 技术参数

生命周期：Obsolete包装说明：DIE,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.65
Is 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：30 VJESD-30 代码：X-XUUC-N8
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标称输出电压：2.5 V
封装主体材料：UNSPECIFIED封装代码：DIE
封装形状：UNSPECIFIED封装形式：UNCASED CHIP
认证状态：Not Qualified最大供电电流 (Isup)：25 mA
表面贴装：YES切换器配置：SINGLE
最大切换频率：500 kHz技术：BIPOLAR
温度等级：COMMERCIAL端子形式：NO LEAD
端子位置：UPPERBase Number Matches：1

UC3844AD 数据手册

 浏览型号UC3844AD的Datasheet PDF文件第2页浏览型号UC3844AD的Datasheet PDF文件第3页浏览型号UC3844AD的Datasheet PDF文件第4页浏览型号UC3844AD的Datasheet PDF文件第5页浏览型号UC3844AD的Datasheet PDF文件第6页浏览型号UC3844AD的Datasheet PDF文件第7页 
LIN DOC #: 1840  
UC184xA/284xA/384xA  
C U R R E N T M O D E P W M C O N T R O L L E R  
P R O D U C T I O N D A T A S H E E T  
T H E I N F I N I T E P O W E R O F I N N O V A T I O N  
DESCRIPTION  
KEY FEATURES  
■ LOW START-UP CURRENT. (0.5mA max.)  
■ TRIMMED OSCILLATOR DISCHARGE  
The UC184xA family of control ICs  
provides all the necessary features to  
implement off-line fixed-frequency,  
current-mode switching power supplies  
with a minimum of external compo-  
nents. The current mode architecture  
demonstrates improved load regulation,  
pulse-by-pulse current limiting and  
inherent protection of the power supply  
output switch. The IC includes: A  
bandgap reference trimmed to ±1%  
accuracy, an error amplifier, a current  
sense comparator with internal clamp to  
1V, a high current totem pole output  
stage for fast switching of power  
MOSFET's, and an externally program-  
mable oscillator to set frequency and  
CURRENT. (See Product Highlight)  
maximum duty cycle. The under-  
voltage lock-out is designed to operate  
with 250µA typ. start-up current,  
allowing an efficient bootstrap supply  
voltage design. Available options for  
this family of products, such as start-up  
voltage hysteresis and duty cycle, are  
summarized below in the Available  
Options section. The UC184xA family  
of control ICs is also available in 14-pin  
SOIC package which makes the Power  
Output Stage Collector and Ground pins  
available.  
p OPTIMIZED FOR OFF-LINE AND DC-TO-DC  
CONVERTERS.  
p AUTOMATIC FEED FORWARD  
COMPENSATION.  
p PULSE-BY-PULSE CURRENT LIMITING.  
p ENHANCED LOAD RESPONSE  
CHARACTERISTICS.  
p UNDER-VOLTAGE LOCKOUT WITH  
HYSTERESIS.  
p DOUBLE PULSE SUPPRESSION.  
p HIGH-CURRENT TOTEM POLE OUTPUT.  
p INTERNALLY TRIMMED BANDGAP  
REFERENCE.  
p 500KHz OPERATION.  
PRODUCT HIGHLIGHT  
p LOW RO ERROR AMPLIFIER.  
COMPARISON OF UC384XA VS. SG384X DISCHARGE CURRENT  
APPLICATIONS  
UC384xA  
■ ECONOMICAL OFF-LINE FLYBACK OR  
SG384x  
SG384x  
Min. Limit  
Max. Limit  
FORWARD CONVERTERS.  
TA=25°C  
■ DC-DC BUCK OR BOOST CONVERTERS.  
■ LOW COST DC MOTOR CONTROL.  
A V A  
I
L
A
B
L
E
O P  
T I O N S  
Part #  
Start-Up Hysteresis Max. Duty  
Voltage  
16V  
Cycle  
<100%  
<100%  
<50%  
<50%  
UCx842A  
6V  
0.8V  
6V  
UCx843A 8.4V  
UCx844A 16V  
UCx845A 8.4V  
7.5  
7.8  
−3σ  
8.3  
Mean  
8.8  
+3σ  
9.3  
0.8V  
Discharge Current Distribution - mA  
PACKAGE ORDER INFORMATION  
Plastic DIP  
8-pin  
Plastic SOIC  
8-pin  
Plastic SOIC  
14-pin  
Ceramic DIP  
8-pin  
TA (°C)  
M
DM  
D
Y
0 to 70  
-40 to 85  
-55 to 125  
UC384xAM  
UC284xAM  
—
UC384xADM  
UC284xADM  
—
UC384xAD  
UC284xAD  
—
—
UC284xAY  
UC184xAY  
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)  
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1  
Copyright © 1995  
Rev. 1.2 12/95  
1
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841  
12345678

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