900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






etcTI

UC2843A-Q1 Datasheet Preview

UC2843A-Q1 Datasheet

CURRENT-MODE PWM CONTROLLER

No Preview Available !

UC2843A-Q1
www.ti.com........................................................................................................................................................................................................ SGLS384 – MAY 2008
CURRENT-MODE PWM CONTROLLER
FEATURES
1
Qualified for Automotive Applications
Extended Temperature Performance of
–40°C to 125°C
Optimized for Off-Line and DC-to-DC
Converters
Low Start-Up Current (<0.5 mA)
Trimmed Oscillator-Discharge Current
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
500-kHz Operation
Low RO Error Amp
D PACKAGE
(TOP VIEW)
COMP
VFB
ISENSE
RT/CT
1
2
3
4
8 VREF
7 VCC
6 OUTPUT
5 GND
DESCRIPTION/ORDERING INFORMATION
The UC2843A control IC is a pin-for-pin compatible improved version of the UC2843. Providing the necessary
features to control current mode switched mode power supplies, this device has the following improved features.
Start up current is specified to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During
undervoltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.
PART NUMBER
UVLO ON
UVLO OFF
MAXIMUM DUTY
CYCLE
UC2843A
8.5 V
7.9 V
<100%
TA
–40°C to 125°C
SOIC-8 – D8
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
Reel of 2500
UC2843AQD8RQ1
TOP-SIDE MARKING
UC2843AQ
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated




etcTI

UC2843A-Q1 Datasheet Preview

UC2843A-Q1 Datasheet

CURRENT-MODE PWM CONTROLLER

No Preview Available !

UC2843A-Q1
SGLS384 – MAY 2008........................................................................................................................................................................................................ www.ti.com
FUNCTIONAL BLOCK DIAGRAM
VCC 7
GND 5
RT/CT 4
VFB 2
COMP 1
I 3SENSE
34 V
2.5 V
Osc
Error
Amp
UVLO
S/R
5-V
REF
VREF
Good
Logic
Internal
Bias
2R
R
S
R
1V
Current
Sense
Comparator
PWM
Latch
VREF
8 5V
50 mA
7 VC
6 Output
5 GND
ABSOLUTE MAXIMUM RATINGS(1)(2)
over operating free-air temperature range (unless otherwise noted)
VCC voltage (low impedance source)
VCC voltage (ICC mA)
IO Output current
Output energy (capacitive load)
Analog inputs (pins 3 and 5)
Error amplifier output sink current
Power dissipation at TA < 25°C (14-pin D package)
θJA Package thermal impedance(3)
Tstg Storage temperature range
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds
VALUE
30
Self limiting
±1
5
–0.3 to 6.3
10
1
97
–65 to 150
260
UNIT
V
A
µJ
V
mA
W
°C/W
°C
°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Unless otherwise indicated, voltages are reference to ground, and currents are positive into and negative out of the specified terminals.
(3) Long-term high-temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of
overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.
2 Submit Documentation Feedback
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): UC2843A-Q1


Part Number UC2843A-Q1
Description CURRENT-MODE PWM CONTROLLER
Maker etcTI
Total Page 16 Pages
PDF Download

UC2843A-Q1 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 UC2843A-Q1 CURRENT-MODE PWM CONTROLLER
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy