ZHCSMC4A june   2020  – october 2020 UCC23514

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Function
    1.     Pin Functions for UCC23514E
    2.     Pin Functions for UCC23514M
    3.     Pin Functions for UCC23514S
    4.     Pin Functions for UCC23514V
  7. 6 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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics
    10. 6.10 Switching Characteristics
    11. 6.11 Insulation Characteristics
    12. 6.12 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Propagation Delay, rise time and fall time
    2. 7.2 IOH and IOL testing
    3. 7.3 CMTI Testing
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power Supply
      2. 8.3.2 Input Stage
      3. 8.3.3 Output Stage
      4. 8.3.4 Protection Features
        1. 8.3.4.1 Undervoltage Lockout (UVLO)
        2. 8.3.4.2 Active Pulldown
        3. 8.3.4.3 Short-Circuit Clamping
        4. 8.3.4.4 Active Miller Clamp (UCC23514M)
    4. 8.4 Device Functional Modes
      1. 8.4.1 ESD Structure
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Selecting the Input Resistor
        2. 9.2.2.2 Gate-Driver Output Resistor
        3. 9.2.2.3 Estimate Gate-Driver Power Loss
        4. 9.2.2.4 Estimating Junction Temperature
        5. 9.2.2.5 Selecting VCC Capacitor
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 PCB Material
  13. 12Mechanical, Packaging, and Orderable Information

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8.3.3 Output Stage

The output stages of the UCC23514 family feature a pullup structure that delivers the highest peak-source current when it is most needed which is during the Miller plateau region of the power-switch turnon transition (when the power-switch drain or collector voltage experiences dV/dt). The output stage pullup structure features a P-channel MOSFET and an additional pull-up N-channel MOSFET in parallel. The function of the N-channel MOSFET is to provide a brief boost in the peak-sourcing current, enabling fast turnon. Fast turnon is accomplished by briefly turning on the N-channel MOSFET during a narrow instant when the output is changing states from low to high. The on-resistance of this N-channel MOSFET (RNMOS) is approximately 5.1 Ω when activated.

Table 8-1 UCC23514 On-Resistance
RNMOSROHROLUNIT
5.19.50.40Ω

The ROH parameter is a DC measurement and is representative of the on-resistance of the P-channel device only. This parameter is only for the P-channel device because the pullup N-channel device is held in the OFF state in DC condition and is turned on only for a brief instant when the output is changing states from low to high. Therefore, the effective resistance of the UCC23514 pullup stage during this brief turnon phase is much lower than what is represented by the ROH parameter, yielding a faster turn on. The turnon-phase output resistance is the parallel combination ROH || RNMOS.

The pulldown structure in the UCC23514 is simply composed of an N-channel MOSFET. The output voltage swing between VCC and VEE provides rail-to-rail operation because of the MOS-out stage which delivers very low dropout.

GUID-A7C6B157-8A33-4587-8E97-9C1712E4AF34-low.gifFigure 8-7 Output Stage
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