TIDA-01371

Programmable ±100-V, High-Current, Floating Linear Regulator Reference Design for Ultrasound Systems

TIDA-01371

Design files

Overview

Ultrasound transmitters require a stable programmable DC power source to drive high current into piezo transducers during the transmission. The TIDA-01371 reference design demonstrates a positive and negative linear regulator that can provide output voltages varying from ±2.5 to ±100V. The programmability (meant to come from a DAC) is implemented using external control voltages. The low-noise performance helps in replacing passive and active noise filters with off-the-shelf low-noise positive and negative LDO regulators and a circuit to float the ground of the regulators. In addition, it uses external power MOSFETs to scale the current capability of regulators to support special imaging modes such as shear wave, or elastography, mode. In order to provide extremely high currents to the transducers, large input capacitors can provide high energy for 1ms of duration keeping the average current drawn from this power supply very low.

Features
  • Floating and tracking regulator, replaces passive and active noise filters with off-the-shelf LDO regulators with better than ±1.5% load regulation
  • Innovative current sharing scheme uses TI's best-in-class low RDS(ON) CSD series power MOSFETs and low impedance driver circuits to improve the transient response
  • Programmable output voltage from ±2.5V to ±100V using control signals coming from DAC
  • Scalable in terms of output current for 1ms pulses (tested up to ±20A) to support special imaging modes
  • Separate and independent positive and negative voltage power supplies enables flexibility in powering the ultrasound transmit circuit

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.

TIDUCI3A.PDF (4109 K)

Reference design overview and verified performance test data

TIDRPX9.PDF (698 K)

Detailed schematic diagram for design layout and components

TIDRPY0.PDF (136 K)

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

TIDRPY1.PDF (351 K)

Detailed overview of design layout for component placement

TIDRPY3.ZIP (1225 K)

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

TIDCD72.ZIP (357 K)

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

TIDRPY2.PDF (2006 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

General-purpose op amps

TLV171Single, 36-V, 3-MHz, low-power operational amplifier for cost-sensitive applications

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

TLV2171Dual, 36-V, 3-MHz, low-power operational amplifier for cost-sensitive applications

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A331-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD19533KCS100-V, N channel NexFET™ power MOSFET, single TO-220, 10.5 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide ±100-V Programmable, Scalable (Current & Voltage) Floating Regulator Ref Design (Rev. A) Jul. 30, 2017
Technical article Take your ultrasound design to the next level Feb. 08, 2018
Technical article What floats your boat? Exploring linear regulators in medical ultrasound May 12, 2017

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-01352 400-W Continuous, Scalable, ±2.5- to ±150-V, Programmable Ultrasound Power Supply Reference Design

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