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UC2843ADMT

Description
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, PLASTIC, SOIC-8
CategoryPower/power management    The power supply circuit   
File Size226KB,8 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Environmental Compliance  
Download Datasheet Parametric View All

UC2843ADMT Overview

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, PLASTIC, SOIC-8

UC2843ADMT Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?incompatible
Objectid1910243261
Parts packaging codeSOIC
package instructionSOP,
Contacts8
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage8.2 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length4.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
Temperature levelINDUSTRIAL
Terminal surfaceTIN LEAD
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
width3.9 mm
LIN D
O C
#:
1840
UC184xA/284xA/384xA
C
URRENT
M
ODE
PWM C
ONTROLLER
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
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.
K E Y F E AT U R E S
s
LOW START-UP CURRENT.
(0.5mA max.)
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.
PRODUCT HIGHLIGHT
C
OMPARISON
OF
UC384
X
A
VS
.
SG384
X
D
ISCHARGE
C
URRENT
A P P L I C AT I O N S
SG384x
Max. Limit
UC384xA
SG384x
Min. Limit
T
A
=25°C
s
ECONOMICAL OFF-LINE FLYBACK OR
FORWARD CONVERTERS.
s
DC-DC BUCK OR BOOST CONVERTERS.
s
LOW COST DC MOTOR CONTROL.
A
V A I L A B L E
O
P T I O N S
Part #
UCx842A
UCx843A
7.5
7.8
8.3
Mean
8.8
9.3
Start-Up Hysteresis Max. Duty
Voltage
Cycle
16V
8.4V
16V
8.4V
6V
0.8V
6V
0.8V
<100%
<100%
<50%
<50%
−3σ
+3σ
UCx844A
UCx845A
Discharge Current Distribution - mA
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(°C)
0 to 70
-40 to 85
-55 to 125
M
Plastic DIP
8-pin
UC384xAM
UC284xAM
DM
Plastic SOIC
8-pin
UC384xADM
UC284xADM
D
Plastic SOIC
14-pin
UC384xAD
UC284xAD
Y
Ceramic DIP
8-pin
UC284xAY
UC184xAY
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright © 1995
Rev. 1.2 12/95
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
1
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