SLUSCK0G November   2017  – November 2024 UCC21220 , UCC21220A

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  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-Limiting Values
    8. 6.8  Electrical Characteristics
    9. 6.9  Switching Characteristics
    10. 6.10 Thermal Derating Curves
    11. 6.11 Typical Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 Minimum Pulses
    2. 7.2 Propagation Delay and Pulse Width Distortion
    3. 7.3 Rising and Falling Time
    4. 7.4 Input and Disable Response Time
    5. 7.5 Power-up UVLO Delay to OUTPUT
    6. 7.6 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 VDD, VCCI, and Under Voltage Lock Out (UVLO)
      2. 8.3.2 Input and Output Logic Table
      3. 8.3.3 Input Stage
      4. 8.3.4 Output Stage
      5. 8.3.5 Diode Structure in UCC21220 and UCC21220A
    4. 8.4 Device Functional Modes
      1. 8.4.1 Disable Pin
  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 Designing INA/INB Input Filter
        2. 9.2.2.2 Select External Bootstrap Diode and its Series Resistor
        3. 9.2.2.3 Gate Driver Output Resistor
        4. 9.2.2.4 Estimating Gate Driver Power Loss
        5. 9.2.2.5 Estimating Junction Temperature
        6. 9.2.2.6 Selecting VCCI, VDDA/B Capacitor
          1. 9.2.2.6.1 Selecting a VCCI Capacitor
          2. 9.2.2.6.2 Selecting a VDDA (Bootstrap) Capacitor
          3. 9.2.2.6.3 Select a VDDB Capacitor
        7. 9.2.2.7 Application Circuits with Output Stage Negative Bias
      3. 9.2.3 Application Curves
  11. 10Power Supply Recommendations
  12. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Component Placement Considerations
      2. 11.1.2 Grounding Considerations
      3. 11.1.3 High-Voltage Considerations
      4. 11.1.4 Thermal Considerations
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  14. 13Revision History
  15. 14Mechanical, Packaging, and Orderable Information

9.2.2.4 Estimating Gate Driver Power Loss

The total loss, PG, in the gate driver subsystem includes the power losses of the UCC21220 and UCC21220A (PGD) and the power losses in the peripheral circuitry, such as the external gate drive resistor. Bootstrap diode loss is not included in PG and not discussed in this section.

PGD is the key power loss which determines the thermal safety-related limits of the UCC21220 and UCC21220A, and it can be estimated by calculating losses from several components.

The first component is the static power loss, PGDQ, which includes quiescent power loss on the driver as well as driver self-power consumption when operating with a certain switching frequency. PGDQ is measured on the bench with no load connected to OUTA and OUTB at a given VCCI, VDDA/VDDB, switching frequency and ambient temperature. Figure 6-6 shows the operating current consumption vs. operating frequency with no load. In this example, VVCCI = 5 V and VVDD = 12 V. The current on each power supply, with INA/INB switching from 0 V to 3.3 V at 100 kHz is measured to be IVCCI ≈ 2.5 mA, and IVDDA = IVDDB ≈ 1.5 mA. Therefore, the PGDQ can be calculated with Equation 10:

Equation 10. UCC21220 UCC21220A

The second component is switching operation loss, PGDO, with a given load capacitance which the driver charges and discharges the load during each switching cycle. Total dynamic loss due to load switching, PGSW, can be estimated with Equation 11:

Equation 11. UCC21220 UCC21220A

where

  • QG is the gate charge of the power transistor.

If a split rail is used to turn on and turn off, then VDD is going to be equal to difference between the positive rail to the negative rail.

So, for this example application:

Equation 12. UCC21220 UCC21220A

QG represents the total gate charge of the power transistor switching 480 V at 14 A provided by the datasheet, and is subject to change with different testing conditions. The UCC21220 and UCC21220A gate driver loss on the output stage, PGDO, is part of PGSW. PGDO will be equal to PGSW if the external gate driver resistances are zero, and all the gate driver loss is dissipated inside the UCC21220 and UCC21220A. If there are external turn-on and turn-off resistances, the total loss will be distributed between the gate driver pull-up/down resistances and external gate resistances. Importantly, the pull-up/down resistance is a linear and fixed resistance if the source/sink current is not saturated to 4 A/6 A, however, it will be non-linear if the source/sink current is saturated. Therefore, PGDO is different in these two scenarios.

Case 1 - Linear Pull-Up/Down Resistor:

Equation 13. UCC21220 UCC21220A

In this design example, all the predicted source/sink currents are less than 4 A/6 A, therefore, the UCC21220 and UCC21220A gate driver loss can be estimated with Equation 14:

Equation 14. UCC21220 UCC21220A

Case 2 - Nonlinear Pull-Up/Down Resistor:

Equation 15. UCC21220 UCC21220A

where

  • VOUTA/B(t) is the gate driver OUTA and OUTB pin voltage during the turn on and off transient, and it can be simplified that a constant current source (4 A at turn-on and 6 A at turn-off) is charging/discharging a load capacitor. Then, the VOUTA/B(t) waveform will be linear and the TR_Sys and TF_Sys can be easily predicted.

For some scenarios, if only one of the pull-up or pull-down circuits is saturated and another one is not, the PGDO will be a combination of Case 1 and Case 2, and the equations can be easily identified for the pull-up and pull-down based on the above discussion. Therefore, total gate driver loss dissipated in the gate driver UCC21220 and UCC21220A, PGD, is:

Equation 16. UCC21220 UCC21220A

which is equal to 127 mW in the design example.