SLUAAY0 September   2025 UCC57102 , UCC57102-Q1 , UCC57102Z , UCC57102Z-Q1 , UCC57108 , UCC57108-Q1 , UCC57132 , UCC57132-Q1 , UCC57138 , UCC57138-Q1 , UCC57142 , UCC57142-Q1 , UCC57148 , UCC57148-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2TI Non-Isolated SiC MOSFET Gate Drivers Overview
  6. 3SiC MOSFET Gate Driver Design Considerations
    1. 3.1 Undervoltage Lockout (UVLO)
    2. 3.2 Negative Bias Supply (Bipolar Drive)
    3. 3.3 Short-Circuit Protection
      1. 3.3.1 Desaturation Protection
      2. 3.3.2 Overcurrent Protection
      3. 3.3.3 Soft Turn-Off
  7. 4PFC CCM Boost Low-Side Gate Driver Example
    1. 4.1 Gate Driver Requirements
    2. 4.2 Gate Driver Selection
    3. 4.3 Gate Driver Power Dissipation
  8. 5Summary
  9. 6References

4 PFC CCM Boost Low-Side Gate Driver Example

In a power factor correction (PFC) continuous conduction mode (CCM) boost application, SiC MOSFETs can offer substantial benefits. The low conduction and switching losses in SiC MOSFETs enable higher efficiency and increased power density for applications above 1kW. Higher switching frequencies can be realized with SiC technology, contributing to magnetics size and cost reduction opportunities. In this example, this application note outlines the low side gate driver considerations for a 3kW PFC CCM boost. Target design parameters are outlined in Table 4-1.

Table 4-1 Design Parameters
DESIGN PARAMETER EXAMPLE VALUE
PFC Input Voltage Range 185-265Vac, 60Hz
PFC Nominal Output Voltage 400VDC
Maximum Steady-State Output Power 3000W
SiC MOSFET Positive Bias Supply +20V
SiC MOSFET Negative Bias Supply -5V
Switching Frequency 60kHz
Switching Slew Rate 20V/ns
Short-circuit Detection Yes
Maximum Ambient Temperature 100°C

In this example the chosen SiC MOSFET has ratings as follows: 650V maximum VDS, 35A continuous ID rating (at Tc = 100C), total QG of 73nC, and 45mΩ typical RDS(on) at VGS = 20V. Figure 4-1 shows the components needed for a typical PFC CCM boost application.

Typical Application of Gate Driver in PFC System Figure 4-1 Typical Application of Gate Driver in PFC System