SLUSG05 March   2025 UC2843L-Q1 , UC2844L-Q1 , UC2845L-Q1

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Device Comparison
  6. Pin Configuration and Functions
  7. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse-by-Pulse Current Limiting
      2. 7.3.2 Current Sense Circuit
      3. 7.3.3 Error Amplifier Configuration
      4. 7.3.4 Undervoltage Lockout
      5. 7.3.5 Oscillator
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Undervoltage Lockout (UVLO) Start-Up
      3. 7.4.3 UVLO Turnoff Mode
  9. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 UC2842A (UC284xL-Q1) Design Procedure
      3. 8.2.3 Application Curves
      4. 8.2.4 Power Supply Recommendations
      5. 8.2.5 Layout
        1. 8.2.5.1 Layout Guidelines
        2. 8.2.5.2 Layout Example
  10. Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Typical Characteristics

UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Oscillator Discharge Current vs Temperature for VCC = 15 V
                            and VRT/CT = 2VFigure 6-1 Oscillator Discharge Current vs Temperature for VCC = 15 V and VRT/CT = 2V
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Error Amplifier Open-Loop Gain and Phase vs Frequency VCC =
                            15 V, RL = 100 kΩ, and TA = 25 °CFigure 6-3 Error Amplifier Open-Loop Gain and Phase vs Frequency VCC = 15 V, RL = 100 kΩ, and TA = 25 °C
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Output Saturation Voltage vs Load Current for VCC = 15 V
                            with 5-ms Input PulsesFigure 6-5 Output Saturation Voltage vs Load Current for VCC = 15 V with 5-ms Input Pulses
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Reference Voltage vs Source CurrentFigure 6-7 Reference Voltage vs Source Current
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Dead Time vs Timing CapacitanceFigure 6-9 Dead Time vs Timing Capacitance
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Current Sense Input Threshold vs Error Amplifier Output Voltage for
                                VCC = 15 VFigure 6-2 Current Sense Input Threshold vs Error Amplifier Output Voltage for VCC = 15 V
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Max Output Duty Cycle vs Timing Resistor for VCC = 15,
                                CT = 3.3 nF, TA = 25 °CFigure 6-4 Max Output Duty Cycle vs Timing Resistor for VCC = 15, CT = 3.3 nF, TA = 25 °C
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Reference Short Circuit Current vs Temperature for VCC = 15
                            VFigure 6-6 Reference Short Circuit Current vs Temperature for VCC = 15 V
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Reference Voltage vs TemperatureFigure 6-8 Reference Voltage vs Temperature
UC2843L-Q1 UC2844L-Q1 UC2845L-Q1 Timing Resistance vs FrequencyFigure 6-10 Timing Resistance vs Frequency