uc2842ay Microsemi Corporation, uc2842ay Datasheet
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uc2842ay
Manufacturer Part Number
uc2842ay
Description
Current Mode Pwms
Manufacturer
Microsemi Corporation
Datasheet
1.UC2842AY.pdf
(8 pages)
T
Copyright © 1995
Rev. 1.2a,2005-03-09
H E
all the necessary features to implement off-line
fixed-frequency, current-mode switching power
supplies
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
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
The UC184xA family of control ICs provides
I
N F I N I T E
C
OMPARISON OF
with
of
-40 to +85
-55 to 125
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. UC3842ADM-TR)
T
0 to 70
power
SG384x
Min. Li m it
A
a
(°C)
P
minimum
O W E R
MOSFET's,
Discharge Cu rrent Dist ribution - mA
7.5
RoHS Compliant / Pb-free
11861 W
M
UC384
Transition DC: 0503
P R O D U C T H I G H L I G H T
T
A
UC384xAM
UC284xAM
-3 s
=25 C
O F
7.8
Plastic DIP
8-Pin
ESTERN
of
D E S C R I P T I O N
L
X
-
UC384xA
I
and
I N
A
external
N N O V A T I O N
A
Mean
VS
F
8.3
VENUE
I N I T Y
an
. SG384
, G
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.
ARDEN
+3s
8.8
DM
PACKAGE ORDER INFO
RoHS Compliant / Pb-free Transition DC: 0440
M
X
UC384xADM
UC284xADm
I C R O E L E C T R O N I C S
G
D
ROVE
9.3
ISCHARGE
Plastic SOIC
8-Pin
, CA. 92841, 714-898-8121, F
SG384x
Max. Limit
-
C
C
URRENT
U R R E N T
P
D
R O D U C T I O N
UC184xA / 284xA / 384xA
UC384xAD
UC284xAD
Plastic SOIC
14-Pin
M
I
-
N C
AX
O D E
: 714-893-2570
.
P W M C
Available Options
UCx842A
UCx843A
UCx844A
UCx845A
D
Part#
Y
A T A
LOW START-UP CURRENT.
(0.5mA max.)
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.
ECONOMICAL OFF-LINE
FLYBACK OR FORWARD
CONVERTERS.
DC-DC BUCK OR BOOST
CONVERTERS.
LOW COST DC MOTOR
CONTROL.
TRIMMED OSCILLATOR
UC284xAY
UC184xAY
K E Y F E A T U R E S
K E Y F E A T U R E S
Start-Up
Ceramic DIP
8-Pin
Voltage
O N T R O L L E R
8.4V
8.4A
16V
16V
S
H E E T
-
Hysteresis
0.8V
0.8V
6V
6V
Max. Duty
<100%
<100%
Cycle
<50%
<50%
1
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uc2842ay 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 ...