SLUAAH0 February   2022 UCC14130-Q1 , UCC14131-Q1 , UCC14140-Q1 , UCC14141-Q1 , UCC14240-Q1 , UCC14241-Q1 , UCC14340-Q1 , UCC14341-Q1 , UCC15240-Q1 , UCC15241-Q1

 

  1.   Trademarks
  2. 1 Introduction
    1. 1.1 Pin Configuration and Functions
  3. 2 Three-Phase Traction Inverter
  4. 3 Gate Drive Bias Requirements
    1. 3.1 Gate Drive Bias Architectures
    2. 3.2 IGBT vs. SiC
    3. 3.3 Determining Required Bias Supply Power
    4. 3.4 Input Voltage Requirements
    5. 3.5 Output Voltage Requirements
  5. 4 Single Positive Isolated Output Voltage
  6. 5 Dual Positive and Negative Output Voltages
  7. 6 Dual Positive Output Voltages
  8. 7 Capacitor Selection
  9. 8 RLIM Current Limit Resistor
    1. 8.1 RLIM Functional Description
    2. 8.2 RLIM Dual Output Configuration
      1. 8.2.1 CVEE Above Nominal Value CVDD Below Nominal Value
      2. 8.2.2 CVEE Below Nominal Value CVDD Above Nominal Value
      3. 8.2.3 Gate Driver Quiescent Current: IQ_VEE > IQ_VDD
      4. 8.2.4 Gate Driver Quiescent Current: IQ_VEE < IQ_VDD
      5. 8.2.5 CVEE Above Nominal Value CVDD Below Nominal Value: IQ_VEE > IQ_VDD
      6. 8.2.6 CVEE Below Nominal Value CVDD Above Nominal Value: IQ_VEE < IQ_VDD
    3. 8.3 RLIM Single Output Configuration
  10. 9 UCC14240-Q1 Excel Design Calculator Tool
  11. 10Thermal Considerations
    1. 10.1 Thermal Resistance
    2. 10.2 Junction-to-Top Thermal Characterization Parameter
    3. 10.3 Thermal Measurement and TJ Calculation Example
  12. 11Enable (ENA) and Power Good (/PG)
  13. 12PCB Layout Considerations
  14. 13Reference Design Example
  15. 14Summary
  16. 15References

1 Introduction

The UCC14240-Q1 is a high-efficiency, low-emissions, 3-kVRMS isolated DC-DC converter module capable of delivering up to 1.5-W of power. The UCC14240-Q1 integrates the control, power switches and transformer into a wide-body, 16-pin SOIC package. This allows systems to reduce size and cost by removing the need for separate isolated power supplies. The UCC14240-Q1 delivers class-leading efficiency in bias supply, power conversion from the primary to the secondary side while removing the need for bulky external transformers or power modules commonly used in existing designs.

This higher level of integration requires fewer components and less printed circuit board (PCB) area as well as significantly reduced height profile compared to discrete and modular power isolation techniques used in the field today. The UCC14240-Q1 operates from an input voltage range of 21 V<VIN<27 V. EV and HEV battery management systems (BMS) and traction inverters use voltage regulators to manage the wide voltage range (typically: 6 V<12 V<40 V) of the 12-V battery. Similarly, an isolated, redundant regulator is sometimes applied to the high-voltage (HV) battery stack with outputs made available to the low-voltage (LV) primary. Either or both of these regulators can easily be programmed to provide 24-V to the UCC14240-Q1 input. The UCC14240-Q1 is then used to convert 24 V from the LV primary to an isolated DC voltage of 18 V<VDD-VEE<25 V on the HV secondary.

Isolated gate driver ICs used in EV and HEV, HV applications are often driving insulated gate bipolar transistors (IGBTs) or silicon carbide (SiC) metal oxide semiconductor field effect transistors (MOSFETs). IGBTs and SiC MOSFETs can switch between zero and a positive voltage (VDD) but more typically require VDD during turn-on and a negative voltage (VEE) during turn-off. The UCC14240-Q1 is easily configurable between single output VDD bias voltage or dual output positive VDD and negative VEE bias voltage.