UC2843A Microsemi Corporation, UC2843A Datasheet
UC2843A
Manufacturer Part Number
UC2843A
Description
Manufacturer
Microsemi Corporation
Datasheet
1.UC2843A.pdf
(8 pages)
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T
Copyright © 1995
Rev. 1.2
H E
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
12/95
I
N F I N I T E
C
OMPARISON OF
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
-55 to 125
-40 to 85
0 to 70
T
A
SG384x
Min. Limit
(°C)
P
O W E R
Discharge Current Distribution - mA
7.5
P R O D U C T H I G H L I G H T
M
UC384
T
Plastic DIP
8-pin
A
UC284xAM
F O R F U R T H E R I N F O R M A T I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
=25°C
UC384xAM
7.8
D E S C R I P T I O N
O F
X
—
UC384xA
11861 W
A
P A C K A G E O R D E R I N F O R M A T I O N
I
Mean
VS
8.3
N N O V A T I O N
. SG384
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.
ESTERN
DM
8.8
UC384xADM
UC284xADM
X
Plastic SOIC
8-pin
A
D
VENUE
9.3
ISCHARGE
—
SG384x
Max. Limit
, G
ARDEN
C
URRENT
C
D
G
U R R E N T
ROVE
UC184xA/284xA/384xA
P
Plastic SOIC
14-pin
UC384xAD
UC284xAD
R O D U C T I O N
, CA. 92841
—
M
O D E
A
UCx842A
UCx843A
UCx844A
UCx845A
p OPTIMIZED FOR OFF-LINE AND DC-TO-DC
p AUTOMATIC FEED FORWARD
p PULSE-BY-PULSE CURRENT LIMITING.
p ENHANCED LOAD RESPONSE
p UNDER-VOLTAGE LOCKOUT WITH
p DOUBLE PULSE SUPPRESSION.
p HIGH-CURRENT TOTEM POLE OUTPUT.
p INTERNALLY TRIMMED BANDGAP
p 500KHz OPERATION.
p LOW R
Part #
V A I L A B L E
LOW START-UP CURRENT. (0.5mA max.)
TRIMMED OSCILLATOR DISCHARGE
CURRENT. (See Product Highlight)
CONVERTERS.
COMPENSATION.
CHARACTERISTICS.
HYSTERESIS.
REFERENCE.
ECONOMICAL OFF-LINE FLYBACK OR
FORWARD CONVERTERS.
DC-DC BUCK OR BOOST CONVERTERS.
LOW COST DC MOTOR CONTROL.
Y
P W M C
Ceramic DIP
8-pin
A P P L I C A T I O N S
D
UC284xAY
UC184xAY
O
K E Y F E A T U R E S
ERROR AMPLIFIER.
A T A
Start-Up Hysteresis Max. Duty
Voltage
8.4V
8.4V
—
16V
16V
O N T R O L L E R
LIN D
S
H E E T
0.8V
0.8V
O
6V
6V
O C
P T I O N S
#: 1840
<100%
<100%
<50%
<50%
Cycle
1
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UC2843A Summary of contents
Page 1
The UC184xA family of control ICs provides all the necessary features ...
Page 2
UC184xA/284xA/384xA ...
Page 3
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for UC384xA with 0°C T ...
Page 4
UC184xA/284xA/384xA Parameter Under-Voltage Lockout Section Start Threshold Min. Operation Voltage After Turn-On PWM Section Maximum Duty ...
Page 5
FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING RESISTOR 1M 100k C = 4.7nF T 10k 0 ...
Page 6
UC184xA/284xA/384xA FIGURE 3. — CURRENT SENSE SPIKE SUPPRESSION V DC BUS CC 7 UCx84xA 6 5 ...
Page 7
...
Page 8
UC184xA/284xA/384xA ...