SLLSER8F June   2017  – January 2019 UCC5310 , UCC5320 , UCC5350 , UCC5390

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1. 3.1 Functional Block Diagram (S, E, and M Versions)
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Function
    1.     Pin Functions
  7. Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Power Ratings
    6. 7.6  Insulation Specifications for D Package
    7. 7.7  Insulation Specifications for DWV Package
    8. 7.8  Safety-Related Certifications For D Package
    9. 7.9  Safety-Related Certifications For DWV Package
    10. 7.10 Safety Limiting Values
    11. 7.11 Electrical Characteristics
    12. 7.12 Switching Characteristics
    13. 7.13 Insulation Characteristics Curves
    14. 7.14 Typical Characteristics
  8. Parameter Measurement Information
    1. 8.1 Propagation Delay, Inverting, and Noninverting Configuration
      1. 8.1.1 CMTI Testing
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Power Supply
      2. 9.3.2 Input Stage
      3. 9.3.3 Output Stage
      4. 9.3.4 Protection Features
        1. 9.3.4.1 Undervoltage Lockout (UVLO)
        2. 9.3.4.2 Active Pulldown
        3. 9.3.4.3 Short-Circuit Clamping
        4. 9.3.4.4 Active Miller Clamp (UCC53x0M)
    4. 9.4 Device Functional Modes
      1. 9.4.1 ESD Structure
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Designing IN+ and IN– Input Filter
        2. 10.2.2.2 Gate-Driver Output Resistor
        3. 10.2.2.3 Estimate Gate-Driver Power Loss
        4. 10.2.2.4 Estimating Junction Temperature
      3. 10.2.3 Selecting VCC1 and VCC2 Capacitors
        1. 10.2.3.1 Selecting a VCC1 Capacitor
        2. 10.2.3.2 Selecting a VCC2 Capacitor
        3. 10.2.3.3 Application Circuits With Output Stage Negative Bias
      4. 10.2.4 Application Curve
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
    3. 12.3 PCB Material
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Certifications
    3. 13.3 Related Links
    4. 13.4 Receiving Notification of Documentation Updates
    5. 13.5 Community Resources
    6. 13.6 Trademarks
    7. 13.7 Electrostatic Discharge Caution
    8. 13.8 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

Gate-Driver Output Resistor

The external gate-driver resistors, RG(ON) and RG(OFF) are used to:

  1. Limit ringing caused by parasitic inductances and capacitances
  2. Limit ringing caused by high voltage or high current switching dv/dt, di/dt, and body-diode reverse recovery
  3. Fine-tune gate drive strength, specifically peak sink and source current to optimize the switching loss
  4. Reduce electromagnetic interference (EMI)

The output stage has a pullup structure consisting of a P-channel MOSFET and an N-channel MOSFET in parallel. The combined peak source current is 4.3 A for the UCC5320 family and 17 A for the UCC5390 family. Use Equation 1 to estimate the peak source current using the UCC5320S as an example.

Equation 1. UCC5310 UCC5320 UCC5350 UCC5390 I_OH.gif

where

  • RON is the external turnon resistance.
  • RGFET_Int is the power transistor internal gate resistance, found in the power transistor data sheet. We will assume 0Ω for our example
  • IOH is the peak source current which is the minimum value between 4.3 A, the gate-driver peak source current, and the calculated value based on the gate-drive loop resistance.

In this example, the peak source current is approximately 1.8 A as calculated in Equation 2.

Equation 2. UCC5310 UCC5320 UCC5350 UCC5390 I_OH(2).gif

Similarly, use Equation 3 to calculate the peak sink current.

Equation 3. UCC5310 UCC5320 UCC5350 UCC5390 I_OL.gif

where

  • ROFF is the external turnoff resistance.
  • IOL is the peak sink current which is the minimum value between 4.4 A, the gate-driver peak sink current, and the calculated value based on the gate-drive loop resistance.

In this example, the peak sink current is the minimum of Equation 4 and 4.4 A.

Equation 4. UCC5310 UCC5320 UCC5350 UCC5390 I_OL(2).gif

NOTE

The estimated peak current is also influenced by PCB layout and load capacitance. Parasitic inductance in the gate-driver loop can slow down the peak gate-drive current and introduce overshoot and undershoot. Therefore, TI strongly recommends that the gate-driver loop should be minimized. Conversely, the peak source and sink current is dominated by loop parasitics when the load capacitance (CISS) of the power transistor is very small (typically less than 1 nF) because the rising and falling time is too small and close to the parasitic ringing period.