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UC2843 Datasheet Preview

UC2843 Datasheet

Current-Mode PWM Controllers

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UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
SLUS223E – APRIL 1997 – REVISED JANUARY 2017
UCx84x Current-Mode PWM Controllers
1 Features
• Optimized for Off-Line and DC-to-DC Converters
• Low Start-Up Current (< 1 mA)
• Automatic Feedforward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load-Response Characteristics
• Undervoltage Lockout With Hysteresis
• Double-Pulse Suppression
• High-Current Totem-Pole Output
• Internally Trimmed Bandgap Reference
• Up to 500-kHz Operation
• Error Amplifier With Low Output Resistance
2 Applications
• Switching Regulators of Any Polarity
• Transformer-Coupled DC-DC Converters
3 Description
The UCx84x series of control integrated circuits
provide the features that are necessary to implement
off-line or DC-to-DC fixed-frequency current-mode
control schemes, with a minimum number of external
components. The internally implemented circuits
include an undervoltage lockout (UVLO), featuring a
start-up current of less than 1 mA, and a precision
reference trimmed for accuracy at the error amplifier
input. Other internal circuits include logic to ensure
latched operation, a pulse-width modulation (PWM)
comparator that also provides current-limit control,
and a totem-pole output stage that is designed to
source or sink high-peak current. The output stage,
suitable for driving N-channel MOSFETs, is low when
it is in the off state.
1
The UCx84x family offers a variety of package
options, temperature range options, choice of
maximum duty cycle, and choice of turnon and turnoff
thresholds and hysteresis ranges. Devices with
higher turnon or turnoff hysteresis are ideal choices
for off-line power supplies, while the devices with a
narrower hysteresis range are suited for DC-DC
applications. The UC184x devices are specified for
operation from –55°C to 125°C, the UC284x series is
specified for operation from –40°C to 85°C, and the
UC384x series is specified for operation from 0°C to
70°C.
Device Information(1)
PART NUMBER PACKAGE (PIN) BODY SIZE (NOM)
CDIP (8)
9.60 mm × 6.67 mm
UC184x
LCCC (20)
8.89 mm × 8.89 mm
CFP (8)
9.21 mm × 5.97 mm
SOIC (8)
4.90 mm × 3.91 mm
UC284x
SOIC (14)
8.65 mm × 3.91 mm
PDIP (8)
9.81 mm × 6.35 mm
SOIC (8)
4.90 mm × 3.91 mm
UC384x
SOIC (14)
PDIP (8)
8.65 mm × 3.91 mm
9.81 mm × 6.35 mm
CFP (8)
9.21 mm × 5.97 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Application
VIN
VCC
OUTPUT
VREF
ISENSE
UC2843
RT/CT
VFB
GROUND COMP
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

UC2843 Datasheet Preview

UC2843 Datasheet

Current-Mode PWM Controllers

No Preview Available !

UC1842, UC2842, UC3842, UC1843, UC2843, UC3843
UC1844, UC2844, UC3844, UC1845, UC2845, UC3845
SLUS223E – APRIL 1997 – REVISED JANUARY 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 7
7.6 Typical Characteristics .............................................. 9
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagrams ..................................... 11
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 20
9 Application and Implementation ........................ 21
9.1 Application Information............................................ 21
9.2 Typical Application .................................................. 21
10 Power Supply Recommendations ..................... 32
11 Layout................................................................... 33
11.1 Layout Guidelines ................................................. 33
11.2 Layout Example .................................................... 34
12 Device and Documentation Support ................. 35
12.1 Related Links ........................................................ 35
12.2 Receiving Notification of Documentation Updates 35
12.3 Community Resources.......................................... 35
12.4 Trademarks ........................................................... 35
12.5 Electrostatic Discharge Caution ............................ 35
12.6 Glossary ................................................................ 35
13 Mechanical, Packaging, and Orderable
Information ........................................................... 36
4 Revision History
Changes from Revision D (August 2016) to Revision E
Page
• Changed VREFLECTED equation. ............................................................................................................................................. 23
• Changed DMAX equation. ..................................................................................................................................................... 24
Changes from Revision C (June 2007) to Revision D
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
• Changed values in the Thermal Information table ................................................................................................................ 6
2 Submit Documentation Feedback
Copyright © 1997–2017, Texas Instruments Incorporated
Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845
UC2845 UC3845


Part Number UC2843
Description Current-Mode PWM Controllers
Maker etcTI
Total Page 30 Pages
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