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UC2843A Datasheet Preview

UC2843A Datasheet

Current-Mode PWM Controllers

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UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
SLUS224F – SEPTEMBER 1994 – REVISED OCTOBER 2017
UCx84xA Current-Mode PWM Controller
1 Features
1 Optimized for Off-Line and DC-DC Converters
• Low Start-Up Current (< 0.5 mA)
• Trimmed Oscillator Discharge Current
• 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
• Create a Custom Design Using the UCx84xA With
the WEBENCH® Power Designer
2 Applications
• Switch Mode Power Supplies (SMPS)
• DC-DC Converters
• Power Modules
• Industrial PSU
• Battery Operated PSU
3 Description
The UCx84xA family of control devices is a pin-for-pin
compatible improved version of the UCx84x family.
Providing the necessary features to control current-
mode or switched-mode power supplies, this family of
devices has many improved features: startup current
is less than 0.5 mA, oscillator discharge is trimmed to
8.3 mA, and during UVLO, the output stage can sink
at least 10 mA at less than 1.2 V for VCC over 5 V.
Device Information(1)
PART NUMBER
PACKAGE BODY SIZE (NOM)
UC1842A, UC1843A,
UC1844A, UC1845A
CDIP (8)
LCCC (20)
6.67 mm × 9.60 mm
8.89 mm × 8.89 mm
UC2843A
PLCC (20)
8.96 mm × 8.96 mm
UC2842A, UC2843A,
UC2844A, UC2845A,
UC3842A, UC3843A,
UC3844A, UC3845A
PDIP (8)
SOIC (8)
SOIC (14)
SOIC (16)
6.35 mm × 9.81 mm
3.91 mm × 4.90 mm
3.91 mm × 8.65 mm
7.50 mm × 10.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
DEVICE
UC1842A
UC1843A
UC1844A
UC1845A
Device Comparison Table
UVLO ON UVLO OFF
MAX DUTY
CYCLE
16 V
10 V
<100%
8.4 V
7.6 V
<100%
16 V
10 V
<50%
8.4 V
7.6 V
<50%
Simplified Application Diagram
VIN
VCC
OUTPUT
VREF
ISENSE
UC2843A
FB
RT/CT
GND
COMP
Copyright © 2017, 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

UC2843A Datasheet Preview

UC2843A Datasheet

Current-Mode PWM Controllers

No Preview Available !

UC1842A, UC1843A, UC1844A, UC1845A
UC2842A, UC2843A, UC2844A, UC2845A
UC3842A, UC3843A, UC3844A, UC3845A
SLUS224F – SEPTEMBER 1994 – REVISED OCTOBER 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 3
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 ESD Ratings.............................................................. 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 7
6.5 Electrical Characteristics........................................... 7
6.6 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Application .................................................. 14
9 Power Supply Recommendations...................... 21
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 23
11 Device and Documentation Support ................. 24
11.1 Device Support...................................................... 24
11.2 Documentation Support ........................................ 24
11.3 Related Links ........................................................ 25
11.4 Receiving Notification of Documentation Updates 25
11.5 Community Resources.......................................... 25
11.6 Trademarks ........................................................... 25
11.7 Electrostatic Discharge Caution ............................ 25
11.8 Glossary ................................................................ 25
12 Mechanical, Packaging, and Orderable
Information ........................................................... 26
2 Submit Documentation Feedback
Copyright © 1994–2017, Texas Instruments Incorporated
Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A
UC3843A UC3844A UC3845A


Part Number UC2843A
Description Current-Mode PWM Controllers
Maker etcTI
Total Page 30 Pages
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