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UC184XA Datasheet(PDF) 1 Page - Microsemi Corporation

Part No. UC184XA
Description  CURRENT MODE PWM CONTROLLER
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Maker  MICROSEMI [Microsemi Corporation]
Homepage  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC184XA Datasheet(HTML) 1 Page - Microsemi Corporation

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DESCRIPTION
KEY FEA TURES
s
s
s
s
s LOW START-UP CURRENT. (0.5mA max.)
s
s
s
s
s TRIMMED OSCILLATOR DISCHARGE
CURRENT.
(See Product Highlight)
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.
p LOW R
O ERROR AMPLIFIER.
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
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.
APPLICA TIONS
s
s
s
s
s ECONOMICAL OFF-LINE FLYBACK OR
FORWARD CONVERTERS.
s DC-DC BUCK OR BOOST CONVERTERS.
s LOW COST DC MOTOR CONTROL.
A V AILABLE
O PTIONS
Part #
Start-Up Hysteresis Max. Duty
Voltage
Cycle
P ACKAGE ORDER INFORMA TION
T
A (°C)
Plastic DIP
8-pin
0 to 70
UC384xAM
UC384xADM
UC384xAD
-40 to 85
UC284xAM
UC284xADM
UC284xAD
UC284xAY
-55 to 125
UC184xAY
M
Plastic SOIC
8-pin
DM
Plastic SOIC
14-pin
D
Ceramic DIP
8-pin
Y
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
UCx842A
16V
6V
<100%
UCx843A
8.4V
0.8V
<100%
UCx844A
16V
6V
<50%
UCx845A
8.4V
0.8V
<50%
PRODUCT HIGHLIGHT
COMPARISON OF UC384XA VS. SG384X DISCHARGE CURRENT
UC384xA
7.5
8.3
9.3
Mean
SG384x
Min. Limit
7.8
−3σ
8.8
+3σ
SG384x
Max. Limit
Discharge Current Distribution - mA
T
A=25°C
C URRENT M ODE PWM C ONTROLLER
P RODUCTION D AT A S HEET
T HE
I NFINITE
P OWER
OF
I NNOV A TION
Copyright © 1995
Rev. 1.2
12/95
FOR FUR THER INFORMA TION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
UC184xA/284xA/384xA
LIN D OC #: 1840
1


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