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UC284XADM Fiches technique(PDF) 1 Page - Microsemi Corporation

No de pièce UC284XADM
Description  CURRENT MODEPWM CONTROLER
Download  8 Pages
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Fabricant  MICROSEMI [Microsemi Corporation]
Site Internet  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC284XADM Fiches technique(HTML) 1 Page - Microsemi Corporation

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P RODU C T ION D AT A S HEET
T HE
I NFI N ITE
P O W ER
OF
I N NOVATIO N
L IN F IN IT Y M IC ROEL E C TRON IC S I NC .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
Copyright
© 1995
Rev. 1.2a,2005-03-09
UC184xA / 284xA / 384xA
C URRENT M ODE PWM C ONTRO L LER
DESCRI PTI O N
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
components. 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 programmable oscillator to set
frequency and maximum duty cycle. The
undervoltage 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.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT H I GHLIGHT
COMPARISON OF UC384XA VS. SG384X DISCHARGECURRENT
UC384xA
7.5
8.3
9.3
Mean
SG384x
Min. Limit
7.8
-3 s
8.8
+3s
SG384x
Max. Limit
Discharge Current Dist ribution - mA
T
A=25 C
KEY FEATUR ES
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 FEATUR ES
ECONOMICAL OFF-LINE
FLYBACK OR FORWARD
CONVERTERS.
DC-DC BUCK OR BOOST
CONVERTERS.
LOW COST DC MOTOR
CONTROL.
Available Options
Part#
Start-Up
Voltage
Hysteresis
Max. Duty
Cycle
UCx842A
16V
6V
<100%
UCx843A
8.4V
0.8V
<100%
UCx844A
16V
6V
<50%
UCx845A
8.4A
0.8V
<50%
PACKAGE ORDER INFO
M
Plastic DIP
8-Pin
DM
Plastic SOIC
8-Pin
D
Plastic SOIC
14-Pin
Y
Ceramic DIP
8-Pin
TA (°C)
RoHS Compliant / Pb-free
Transition DC: 0503
RoHS Compliant / Pb-free Transition DC: 0440
0 to 70
UC384xAM
UC384xADM
UC384xAD
-
-40 to +85
UC284xAM
UC284xADm
UC284xAD
UC284xAY
-55 to 125
-
-
-
UC184xAY
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR)


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