SPI-programmable, 16-bit 36-V 1-A power supply with integrated current shunt reference design


Design files


This verified design provides the theory, component selection, simulation, PCB design, and measurement details for a SPI controlled 36V power supply capable of sourcing 1A.  It also includes an intergrated high-side current shunt accurate to 1% across multiple decades of current load.  The output of the design is sourced by the DAC8871 which supports both unipolar and bipolar output ranges.  As a result, this circuit can be easily modified to meet the needs of many different applications.

  • 36V @ 1A Load SPI Controlled Output
  • 0.08% Measured FSR Gain Error
  • 8.2mV Measured Offset Error
  • Current Monitor Output
  • Variable Decades of Current Measurement

This verified design includes:

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options
??image.gallery.download_en_US?? View video with transcript Video

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.

TIDR153.PDF (199 K)

Detailed schematic diagram for design layout and components

TIDC026.ZIP (3066 K)

Detailed schematic diagram for design layout and components

TIDR154.PDF (196 K)

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

TIDC042.ZIP (2729 K)

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


Includes TI products in the design and potential alternatives.

Difference amplifiers

INA146High-Voltage, Programmable Gain Difference Amplifier

Data sheet: PDF | HTML
General-purpose op amps

LF411Single, 36-V, 3-MHz, high slew rate (13-V/µs), 2-mV offset voltage, JFET-input op amp

Data sheet: PDF
Power op amps

OPA549High-Voltage, High-Current Op Amp, Excellent Output Swing

Data sheet: PDF
Precision DACs (≤10 MSPS)

DAC887116-Bit Single Channel, Serial Interface, +/-18V (High Voltage Bipolar) Output DAC

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA140Single-channel, 11-MHz, low-noise 36-V JFET precision operational amplifier with rail-to-rail output

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA227710µV, 0.1µV/˚C, High-Precision, Low-Power Operational Amplifier

Data sheet: PDF | HTML
Series voltage references

REF1022.5-ppm/°C drift, 10-V precision voltage reference

Data sheet: PDF

Start development


Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* User guide 36-V 1-A SPI Controlled Power Supply With Integrated Current Shunt Design Guide (Rev. A) Jul. 16, 2014

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​