Isolated IGBT and SiC driver bias supply reference design for traction-inverter applications


Design files


This isolated open-loop LLC transformer driver converter provides dual +20-V and -4-V outputs up to 6 W for traction inverter applications. The LLC topology allows the transformer to have significant leakage inductance, but a much smaller primary-secondary capacitance, which significantly reduces common-mode current injection through the bias transformer. This reference design offers a high level of integration and high efficiency in a compact form factor. 

  • Open-loop architecture eliminates secondary feedback resulting in a compact size
  • LLC topology utilizes the transformer's leakage inductance allowing small secondary side resonant capacitors
  • Secondary-side resonance is less sensitive to external component tolerances
  • High efficiency (85% at 50% loading)
  • Excellent total output voltage regulation
Output voltage options PMP22835.1 PMP22835.2
Vin (Min) (V) 24 24
Vin (Max) (V) 24 24
Vout (Nom) (V) 20 -4
Iout (Max) (A) .3 .3
Output Power (W) 6 1.2
Isolated/Non-Isolated Isolated Isolated
Input Type DC DC
Topology Half Bridge- LLC Half Bridge- LLC

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDT226.PDF (3991 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDM852.PDF (171 K)

Detailed schematic diagram for design layout and components

TIDM853.PDF (166 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDM854.PDF (129 K)

Detailed overview of design layout for component placement

TIDM856.ZIP (689 K)

Files used for 3D models or 2D drawings of IC components

TIDCG05.ZIP (493 K)

Design file that contains information on physical board layer of design PCB

TIDM855.PDF (451 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Isolated DC/DC converters & modules

UCC25800-Q1Ultra-low EMI transformer driver for isolated bias supplies

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report Isolated IGBT and SiC Driver Bias Supply Ref. Design for Traction-Inverter Apps PDF | HTML Apr. 01, 2021
White paper High-Voltage Semiconductor Solutions for Meeting Isolation Requirements (Rev. A) PDF | HTML Jun. 06, 2022
White paper 높 은 신뢰도와 합리적인 가격대의 절연 기술 개발과 관련한 고전압 설계 문 제의 해결.. (Rev. A) PDF | HTML Jun. 06, 2022
White paper 以可靠且經濟實惠的隔離技術解決高電壓設計難題 (Rev. A) PDF | HTML Jun. 06, 2022
More literature Isolated gate-driver bias-supply design considerations PPT Dec. 02, 2021

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