UC3842A 查看數據表（PDF） - Microsemi Corporation
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UC3842A Datasheet PDF : 8 Pages
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THE INFINITE POWER OF INNOVATION
UC184xA / 284xA / 384xA
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
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
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 UC384XA VS. SG384X DISCHARGECURRENT
SG384x
Min. Limit
UC384xA
TA=25 C
SG384x
Max. Limit
KEY FEATURES
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.
KEY FEATURES
ECONOMICAL OFF-LINE
FLYBACK OR FORWARD
CONVERTERS.
DC-DC BUCK OR BOOST
CONVERTERS.
LOW COST DC MOTOR
CONTROL.
7.5 7.8
-3 s
8.3
Mean
8.8 9.3
+3s
Discharge Current Dist ribution - mA
Available Options
Part#
Start-Up
Voltage
Hysteresis
UCx842A 16V
6V
UCx843A 8.4V
0.8V
UCx844A 16V
6V
UCx845A 8.4A
0.8V
Max. Duty
Cycle
<100%
<100%
<50%
<50%
PACKAGE ORDER INFO
TA (°C)
M Plastic DIP
8-Pin
DM D Plastic SOIC
8-Pin
Plastic SOIC
14-Pin
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
-
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR)
Y Ceramic DIP
8-Pin
-
UC284xAY
UC184xAY
Copyright © 1995
Rev. 1.2a,2005-03-09
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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