Bidirectional 400-V/12-V DC/DC Converter Reference Design


Design files


The Bidirectional 400V-12V DC/DC Converter Reference Design is a microcontroller-based implementation of an isolated bi-directional DC-DC converter.  A phase shifted full-bridge (PSFB) with synchronous rectification controls power flow from a 400V bus/battery to the 12V battery in step-down mode, while a push-pull stage controls the reverse power flow from the low voltage battery to the high voltage bus/battery in boost mode.  In this implementation closed loop control for both directions of power flow is implemented using Texas Instruments 32-bit microcontroller TMS320F28035, which is placed on the LV side. This digitally-controller system can implement advanced control strategies to optimally control the power stage under different conditions and also provide system level intelligence to make safe and seamless transitions between operation modes and PWM switching patterns.

  • Digitally-controlled isolated bidirectional DC/DC converter based on the TMS320F28035 microcontroller
  • 300W rated output operation in either direction
  • High voltage DC input: 200-400V
  • Low voltage DC output: 9-13.5.V (nominal 12V)
  • Seamless on-the-fly transitions between buck and boost modes
  • Complete software package (please see link below for software download instructions)
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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.

TIDUAI7.PDF (12520 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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

TIDCB47.ZIP (1829 K)

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

TIDRHT1.PDF (14420 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

C2000 real-time microcontrollers

TMS320F28035C2000™ 32-bit MCU with 60 MHz, 128 KB flash, CLA

Data sheet: PDF
C2000 real-time microcontrollers

TMS320F28035-Q1Automotive C2000™ 32-bit MCU with 60 MHz, 128 KB flash, CLA

Data sheet: PDF
Buck modules (integrated inductor)

PTH08080W2.25 A, 4.5-V to 18-V Input Wide Adjust Miniature Power Module

Data sheet: PDF
D-type flip-flops

SN74LVC2G74Single Positive-Edge-Triggered D-Type Flip-Flop with Clear and Preset

Data sheet: PDF | HTML
Digital isolators

ISO7240CQuad-channel, 4/0, 25-Mbps digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7242CQuad-channel, 2/2, 25-Mbps digital isolator

Data sheet: PDF | HTML
General-purpose op amps

OPA345Single, 5.5-V, 3-MHz, RRIO operational amplifier

Data sheet: PDF
Isolated CAN transceivers

ISO1050Isolated 5-V CAN transceiver

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

DCH010505SMiniature, 1W, 3kVDC Isolated DC/DC Converters

Data sheet: PDF
Linear & low-dropout (LDO) regulators

TPS730200-mA, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Low-side drivers

UCC275245-A/5-A dual-channel gate driver with 5-V UVLO, enable, and 1-ns delay Matching

Data sheet: PDF | HTML

Technical documentation

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* Design guide Bidirectional DC-DC Converter Design Guide Sep. 01, 2015
White paper Breakthrough technologies lead the solar power industry into the future Jul. 27, 2018
White paper Driving the green revolution in transportation Sep. 23, 2016

Related design resources

Software development

CONTROLSUITE controlSUITE™ Software Suite: Software and Development Tools for C2000™ Microcontrollers

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