50- to 150-VIN, 28-V 5-A synchronous buck converter reference design for 100-kRad space applications


Design files


This reference design is a 28-V output, 5-A synchronous buck converter for space applications operating from a 50-V to 150-V input range. The TPS7H5001-SP PWM controller controls the power stage. The INA901-SP senses the inductor current and provides current feedback to the controller enabling both average current mode control and output short-circuit protection. If these features are not needed, the INA901-SP can be removed and the TPS7H5001-SP can be operated with voltage mode control. The adjustable deadtime of the TPS7H5001-SP allows the timing of the switching MOSFETs to be optimized and results in over 94% efficiency with 100-V input and over 96% efficiency with 50-V input. A self-biasing circuit is included to power the control circuits directly from the output. If an external 12-V bias is provided, the self-biasing circuit can be removed and result in higher efficiency.

  • Radiation of TID 100-krad(Si), SEL/SEB/SEGR immune up to 75 MeV.cm2/mg
  • Space-grade MOSFET based
  • >94% efficiency @ 100-VIN
  • Overcurrent protection
  • Synchronizable
Output voltage options PMP23193.1
Vin (Min) (V) 50
Vin (Max) (V) 150
Vout (Nom) (V) 28
Iout (Max) (A) 5
Output Power (W) 140
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck- Synchronous
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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.

TIDT333.PDF (1014 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


Detailed overview of design layout for component placement

TIDMBI4.ZIP (1580 K)

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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

TPS7H5001-SPRadiation-hardened, QMLV and QMLP 2-MHz dual-output PWM controller with synchronous rectification

Data sheet: PDF | HTML
Analog current-sense amplifiers

INA901-SPRadiation hardened, -15-V to 65-V, split-stage current sense amplifier with in-line filter option

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

LM117HVQML-SPRadiation-hardened QMLV, 4.2-V to 60-V input, 500-mA adjustable output linear regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report 50- to 150-VIN, 28-V 5-A Sync. Buck Converter RefDes for 100-kRad Space Apps PDF | HTML May 02, 2023

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