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UC1843A PDF预览

UC1843A

更新时间: 2024-11-27 14:53:51
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美国微芯 - MICROCHIP /
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8页 381K
描述
Control ICs provides all the necessary features to implement off-line fixed-frequency, current-mod

UC1843A 数据手册

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UC184xA / 284xA / 384xA  
CURRENT  
MODE PWM CONTROLLER  
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  
KEY FEATURES  
DESCRIPTION  
The UC184xA family of control ICs provides externally programmable oscillator to set  
all the necessary features to implement off-line frequency and maximum duty cycle. The  
fixed-frequency, current-mode switching power undervoltage lock-out is designed to operate with  
„
LOW START-UP CURRENT.  
(0.5mA max.)  
TRIMMED OSCILLATOR  
DISCHARGE CURRENT. (See  
Product Highlight)  
OPTIMIZED FOR OFF-LINE  
AND DC-TO-DC  
CONVERTERS.  
AUTOMATIC FEED FORWARD  
COMPENSATION.  
PULSE-BY-PULSE CURRENT  
LIMITING.  
ENHANCED LOAD RESPONSE  
CHARACTERISTICS.  
UNDER-VOLTAGE LOCKOUT  
WITH HYSTERESIS.  
DOUBLE PULSE  
SUPPRESSION.  
HIGH-CURRENT TOTEM POLE  
OUTPUT.  
INTERNALLY TRIMMED  
BANDGAP REFERENCE.  
500KHz OPERATION.  
LOW RO ERROR AMPLIFIER.  
„
supplies with  
a
minimum of external 250µA typ. start-up current, allowing an efficient  
components. The current mode architecture bootstrap supply voltage design. Available  
demonstrates improved load regulation, pulse- options for this family of products, such as start-  
by-pulse current limiting and inherent protection up voltage hysteresis and duty cycle, are  
of the power supply output switch. The IC summarized below in the Available Options  
includes: A bandgap reference trimmed to ±1% section. The UC184xA family of control ICs is  
accuracy, an error amplifier, a current sense also available in 14-pin SOIC package which  
comparator with internal clamp to 1V, a high makes the Power Output Stage Collector and  
current totem pole output stage for fast Ground pins available.  
„
„
„
„
„
„
„
„
switching of power MOSFET's, and an  
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com  
PRODUCT HIGHLIGHT  
COMPARISON OF UC384  
XA  
VS. SG384  
X
D
ISCHARGE URRENT  
C
UC384xA  
„
„
SG384x  
Min. Limit  
SG384x  
Max. Limit  
T =25 C  
A
KEY FEATURES  
„
ECONOMICAL OFF-LINE  
FLYBACK OR FORWARD  
CONVERTERS.  
„
„
DC-DC BUCK OR BOOST  
CONVERTERS.  
LOW COST DC MOTOR  
CONTROL.  
7.5  
7.8  
-3s  
8.3  
Mean  
8.8  
+3s  
9.3  
Available Options  
Start-Up  
Max. Duty  
Cycle  
Part#  
Hysteresis  
Voltage  
UCx842A  
UCx843A  
UCx844A  
UCx845A  
16V  
8.4V  
16V  
6V  
0.8V  
6V  
<100%  
<100%  
<50%  
Discharge Current Distribution - mA  
8.4A  
0.8V  
<50%  
PACKAGE ORDER INFO  
Plastic DIP  
8-Pin  
Plastic SOIC  
8-Pin  
Plastic SOIC  
14-Pin  
Ceramic DIP  
8-Pin  
M
DM  
D
Y
TA (°C)  
RoHS Compliant / Pb-free  
Transition DC: 0503  
RoHS Compliant / Pb-free Transition DC: 0440  
0 to 70  
-40 to +85  
-55 to 125  
UC384xAM  
UC284xAM  
-
UC384xADM  
UC284xADm  
-
UC384xAD  
UC284xAD  
-
-
UC284xAY  
UC184xAY  
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR)  
Copyright © 1995  
Rev. 1.2a,2005-03-09  
1

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