SGLS164A April   2003  – October 2024 UC2842AQ , UC2843AQ , UC2845AQ

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Electrical Characteristics
    4. 5.4 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Functional Block Diagram
  9. 8 Application and Implementation
    1. 8.1 Application Information
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

3 Description

The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is designed to be less than 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V.

The difference between members of this family are shown in the table below.

Package Information
PART NUMBER PACKAGE(1) PACKAGE SIZE(2)
UC2842A, UC2843A, UC2844A, UC2845A D (SOIC, 8) 4.90mm × 6.00mm
D (SOIC, 14) 8.65mm × 6.00mm
(1) For all available packages, see Section 11.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
Device Information
PART NUMBER(1) UVLO ON UVLO OFF MAXIMUM DUTY CYCLE
UC2842A 16V 10V <100%
UC2843A 8.5V 7.9V <100%
UC2844A 16V 10V <50%
UC2845A 8.5V 7.9V <50%
(1) For all available packages, see the orderable addendum at the end of the data sheet.
UC2842AQ UC2843AQ UC2844AQ UC2845AQ Functional DiagramFunctional Diagram
UC2842AQ UC2843AQ UC2844AQ UC2845AQ Ordering InformationOrdering Information