Automotive four-rails 17-W isolated flyback reference design


Design files


This reference design is an isolated flyback that supplies four independent rails; each of them delivers 14 V @ 300 mA. The voltage feedback loop is closed to primary side, therefore, avoiding the optocoupler and increasing the reliability of the converter. The high switching frequency (500 KHz) allows the use of a small transformer and filter components. A digital enable input removes the bias voltage to the controller, therefore reducing the current consumption practically to zero.

  • High-voltage isolation, low capacitance between channels
  • Primary side regulation with no optocoupler
  • Suitable for high and low side IGBT drivers
  • Zero quiescent current when disabled
Output voltage options PMP30700.1 PMP30700.2 PMP30700.3 PMP30700.4
Vin (Min) (V) 6 6 6 6
Vin (Max) (V) 27 27 27 27
Vout (Nom) (V) 14 14 14 14
Iout (Max) (A) .3 .3 .3 .3
Output Power (W) 4.2 4.2 4.2 4.2
Isolated/Non-Isolated Isolated Isolated Isolated Isolated
Input Type DC DC DC DC
Topology Flyback- Non Sync Flyback- Non Sync Flyback- Non Sync Flyback- Non Sync
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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.

TIDT172.PDF (1938 K)

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

TIDM532.PDF (229 K)

Detailed schematic diagram for design layout and components

TIDM533.PDF (133 K)

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

TIDM534.PDF (222 K)

Detailed overview of design layout for component placement

TIDM536.ZIP (852 K)

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


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

TIDM535.PDF (455 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

LM51551-Q12.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection

Data sheet: PDF | HTML
N-channel MOSFETs

CSD18537NQ5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 13 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report Automotive Four-Rails 17-W Isolated Flyback Reference Design Apr. 02, 2020

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