Your cart is empty.

IC reference design search
IC manufacturers Texas Instruments

IC manufacturers (83)

Texas Instruments UCC25800

UCC25800-Q1 Open-Loop LLC Transformer Driver for Isolated Bias Supplies


TopologyLLC Resonant Converter
Input voltage24 V
Switching frequency100-1200 kHz
Output 115 V / 0.14 A
IC revisionA


These isolated gate drivers require their isolated bias supplies to be low cost, high reliability, low EMI, and immune to high CMTI (Common Mode Transient Immunity). UCC25800 open-loop LLC transformer driver is designed to meet these design challenges and provides a robust, cost effective, and low EMI solution for isolated gate driver bias. This application note introduces the LLC topology and the benefits of using LLC for isolated gate driver bias supplies. It also provides the design guidelines to simplify the design process.


  • Open-Loop LLC transformer driver
  • Ultra-low EMI
  • 9-V ~ 34-V supply range
  • 6-W output power with 24-V input
  • Resistor programmable switching frequency from 100 kHz to 1.2 MHz
  • Synchronization to external clock
  • Programmable maximum dead-time with automatic dead-time adjustment
  • Under voltage lockout
  • Adjustable over-current protection threshold
  • External disable function
  • Input over voltage protection
  • Over temperature protection (TSD)
  • Fault-code output for system intelligence
  • Latched and fault-auto-restart versions available
  • 8-Pin DGN package with thermal pad

Typical applications

  • Automotive traction inverter,IGBT and SiC gate driver bias, Automotive DC/DC, automotive on-board charger, EV charging station, automotive super charger, UPS and solar inverters, Industrial motors, elevators, and escalators.


Order Code Data­sheet Downloads Product series Samples
Auxiliary Gate Drive Transformer
Order Code Data­sheet
Order Code Data­sheet Downloads Product series Samples