Isolated 5-V bias supply for automotive CISPR 25, class 5 emissions, reference design


Design files


This reference design demonstrates EMI mitigation techniques required for a high frequency, reinforced 5-kVRMS isolated, 5-V bias DC/DC converter module to pass the automotive, CIPSR 25, class 5, EMC test standard. The design features a 500-mW, high efficiency bias supply with integrated transformer, control and power stage in a 2.65 mm height SOIC-16 package solution.  Typical bias examples include: digital isolators, voltage and current sensing, CAN transceivers and signal communication used in the design of traction inverters, on-board chargers, battery management systems, infotainment, charging cables and PTC heaters.

  • Passes CISPR 25, class 5 conducted and radiated emissions
  • Low component count, small size, high integration, low profile
  • Integrated IC level transformer rated for 5-kVRMS isolation
  • AEC-Q100 qualified, functional safety capable
  • This design has been tested and verified in an independent, certified anechoic EMI chamber
Output voltage options PMP22845.1
Vin (Min) (V) 4.7
Vin (Max) (V) 5.3
Vout (Nom) (V) 5
Iout (Max) (A) .1
Output Power (W) .5
Isolated/Non-Isolated Isolated
Input Type DC
Topology Other
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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.

TIDM865.PDF (173 K)

Detailed schematic diagram for design layout and components

TIDM866.PDF (125 K)

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

TIDM867.PDF (250 K)

Detailed overview of design layout for component placement

TIDM869.ZIP (518 K)

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

TIDCG08.ZIP (3089 K)

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

TIDM868.PDF (862 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Isolated power modules (integrated transformer)

UCC12051-Q1Automotive, 500-mW, 5-kVrms isolated DC/DC module with integrated transformer

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* User guide Isolated 5-V Bias Supply for Automotive CISPR 25, Class 5 Emissions, Ref. Design PDF | HTML Apr. 20, 2021
White paper 신뢰할 수 있는 합리적 가격대의 절연 기술 개발과 관련한 고전압 설계 문제의 해결 (Rev. C) PDF | HTML Feb. 15, 2024
White paper 以可靠且經濟實惠的隔離技術解決高電壓設計挑戰 (Rev. C) PDF | HTML Feb. 15, 2024
White paper Addressing High-Volt Design Challenges w/ Reliable and Affordable Isolation Tech (Rev. C) PDF | HTML Sep. 26, 2023

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