SLUSA12B December 2009  – October 2017 UCC28C40-Q1 , UCC28C41-Q1 , UCC28C42-Q1 , UCC28C43-Q1 , UCC28C44-Q1 , UCC28C45-Q1

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1 Detailed Pin Description
        1. 8.3.1.1COMP
        2. 8.3.1.2FB
        3. 8.3.1.3CS
        4. 8.3.1.4RT/CT
        5. 8.3.1.5GND
        6. 8.3.1.6OUT
        7. 8.3.1.7VDD
        8. 8.3.1.8VREF
      2. 8.3.2 Undervoltage Lockout
      3. 8.3.3 ±1% Internal Reference Voltage
      4. 8.3.4 Current Sense and Overcurrent Limit
      5. 8.3.5 Reduced-Discharge Current Variation
      6. 8.3.6 Oscillator Synchronization
      7. 8.3.7 Soft Start
      8. 8.3.8 Enable and Disable
      9. 8.3.9 Slope Compensation
      10. 8.3.10Voltage Mode
    4. 8.4Device Functional Modes
      1. 8.4.1Normal Operation
      2. 8.4.2UVLO Mode
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Input Bulk Capacitor and Minimum Bulk Voltage
        3. 9.2.2.3 Transformer Turns Ratio and Maximum Duty Cycle
        4. 9.2.2.4 Transformer Inductance and Peak Currents
        5. 9.2.2.5 Output Capacitor
        6. 9.2.2.6 Current Sensing Network
        7. 9.2.2.7 Gate Drive Resistor
        8. 9.2.2.8 VREF Capacitor
        9. 9.2.2.9 RT/CT
        10. 9.2.2.10Start-Up Circuit
        11. 9.2.2.11Voltage Feedback Compensation
          1. 9.2.2.11.1Power Stage Poles and Zeroes
          2. 9.2.2.11.2Slope Compensation
          3. 9.2.2.11.3Open-Loop Gain
          4. 9.2.2.11.4Compensation Loop
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
      1. 11.1.1Precautions
      2. 11.1.2Feedback Traces
      3. 11.1.3Bypass Capacitors
      4. 11.1.4Compensation Components
      5. 11.1.5Traces and Ground Planes
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Development Support
        1. 12.1.1.1Custom Design With WEBENCH® Tools
    2. 12.2Documentation Support
      1. 12.2.1Related Documentation
    3. 12.3Related Links
    4. 12.4Community Resource
    5. 12.5Trademarks
    6. 12.6Electrostatic Discharge Caution
    7. 12.7Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Features

  • AEC-Q100 Qualified with the Following Results:
    • Device Temperature Grade 1:-40⁰C to 125⁰C
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: 750 V
  • 1-MHz Operation
  • 50-μA Standby Current, 100-μA Maximum
  • Low Operating Current of 2.3 mA at 52 kHz
  • Fast 35-ns Cycle-by-Cycle Over-Current Limiting
  • ±1-A Peak Output Current
  • Rail-to-Rail Output Swings With 25-ns Rise and 20-ns Fall Times
  • ±1% Initial Trimmed 2.5-V Error Amplifier Reference
  • Trimmed Oscillator Discharge Current
  • New Undervoltage Lockout Versions
  • Create a Custom Design Using the UCC28C4x-Q1 With the WEBENCH® Power Designer

Applications

  • Automotive Power Supplies
  • Hybrid and Electric Vehicles in Automotive
  • Switch Mode Power Supplies
  • DC-to-DC Converters
  • Board Mount Power Modules

Description

The UCC28C4x-Q1 family devices are high performance current-mode PWM controllers. They are enhanced BiCMOS versions with pin-for-pin compatibility to the industry standard UC28C4x family PWM controllers.

Providing necessary features to control fixed frequency, peak current mode power supplies, this family offers several performance advantages. These devices offer high frequency operation up to 1 MHz with low start up and operating currents, thus minimizing start up loss and low operating power consumption for improved efficiency. The devices also feature a fast current sense to output delay time of 35 ns, and a ±1-A peak output current capability with improved rise and fall times for driving large external MOSFETs directly.

The UCC28C4x-Q1 family is offered in the 8-pin SOIC (D) package.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
UCC28C40-Q1(2)SOIC (8)4.90 mm × 3.91 mm
UCC28C41-Q1(2)
UCC28C42-Q1(2)
UCC28C43-Q1
UCC28C44-Q1(2)
UCC28C45-Q1(2)
  1. For all available packages, see the orderable addendum at the end of the datasheet.
  2. Preview status.

Typical Automotive Application Example

UCC28C40-Q1 UCC28C41-Q1 UCC28C42-Q1 UCC28C43-Q1 UCC28C44-Q1 UCC28C45-Q1 typical_application_design_sch_slus458_cover.png