SLUS495J August   2001  – December 2023 UCC29002 , UCC39002

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Pin Configuration and Functions
    1.     Pin Functions
  6. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Differential Current-Sense Amplifier (CS+, CS−, CSO)
      2. 6.3.2 Load-Share Bus Driver Amplifier (CSO, LS)
      3. 6.3.3 Load-Share Bus Receiver Amplifier (LS)
      4. 6.3.4 Error Amplifier (EAO)
      5. 6.3.5 Adjust Amplifier Output (ADJ)
      6. 6.3.6 Enable Function (CS+, CS−)
      7. 6.3.7 Fault Protection on LS Bus
      8. 6.3.8 Start-Up and Adjust Logic
      9. 6.3.9 Bias Input and Bias_OK Circuit (VDD)
    4. 6.4 Device Functional Modes
      1. 6.4.1 Start-Up Mode
      2. 6.4.2 Normal Running Mode
      3. 6.4.3 Fault Mode
      4. 6.4.4 Disabled Mode
  8. 7Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Paralleling the Power Modules
    3. 7.3 Typical Application
      1. 7.3.1 Measuring the Voltage Loop of a Power Module
      2. 7.3.2 Detailed Design Procedure
        1. 7.3.2.1 The Shunt Resistor
        2. 7.3.2.2 The CSA Gain
        3. 7.3.2.3 Determining RADJ
        4. 7.3.2.4 Error Amplifier Compensation
      3. 7.3.3 Application Curve
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
  9. 8Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
      1. 8.1.1 Documentation Support
    2. 8.2 Related Links
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9Revision History
  11.   Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.2.1 The Shunt Resistor

Selection of the shunt resistor RSHUNT value is limited (in part) by the voltage drop that is developed by the maximum load-sharing current of the module. This voltage drop should be much less than the maximum voltage adjustment range ΔVADJ(max) of the module by at least a factor of 10, as shown in Equation 3.

Equation 3. GUID-6D8A89FE-926B-4885-BAA5-4C21D1597F16-low.gif

Other limitations for RSHUNT include the maximum allowable power dissipation and available component ratings. On the other hand, the value of RSHUNT should be high enough to avoid signal degradation from noise or requiring excessive amplification by the CSA.