CISPR 25 Class 5, 3-W SEPIC reference design for automotive infotainment display power


Design files


PMP9481 is a conducted EMI optimized (CISPR 25 Class 5) 3W SEPIC converter for wide range Vin automotive applications using the LM5001 regulator IC.  The design accepts an input voltage of 6.5Vin to 20Vin and provides an output of 12Vout capable of supplying 0.25A of current to the load.  This design features the LM5001 boost controller available in automotive grade versions and qualified in AEC-Q100 Grade 1.  LM5001 has a very wide Vin range of 3.1V to 75V and hence is input transient protected.  The board layout is optimized for improved conducted EMI performance.  The board is tested under the automotive EMC standard, CISPR 25, and its conducted emissions are in compliance with the CISPR 25 Class 5 requirements.

  • CISPR 25 Class 5 conducted emissions standard compliance
  • EMI performance optimized layout
  • 500KHz switching frequency to avoid high frequency noise and input EMI filter to suppress conducted emissions
  • LM5001-Q1- AEC-Q100 qualified
  • Wide Vin range of 3.1V to 75V, input transient protection
  • Integrated high voltage bias regulator
  • Very low rise in temperature – best suited for automotive applications
Output voltage options PMP9481.1
Vin (Min) (V) 6.5
Vin (Max) (V) 20
Vout (Nom) (V) 12
Iout (Max) (A) .25
Output Power (W) 3
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Sepic- Integrated Switch
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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

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TIDU552.PDF (2933 K)

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


Detailed schematic diagram for design layout and components


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

TIDC636.ZIP (178 K)

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


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM50013.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

LM5001-Q13.1-V to 75-V wide VIN, 1-A current mode non-synchronous switch mode regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP9481 Test Results Sep. 23, 2014

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