Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser

(ACTIVE) TIDA-01458

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Key Document

Description

This reference design allows a digitally programmable power supply to power an ultrasound transmit circuit for continuous wave (CW) mode from a 24-V bus. There are two outputs adjustable from ±2.5 to ±12 V under user software control. These outputs can provide up to 2 A with very low ripple and noise on both positive and negative regulator outputs. The power supply is scalable for higher output currents up to 3 A by adding more regulators in parallel. The power supplies can also be synchronized to an external clock.

Features
  • Separate and independent positive and negative voltage power supplies for CW mode in ultrasonic
  • To reduce ripple at output's high performance, low noise LDOs are operated as power filters to obtain lowest ripple with minimum heat dissipation in LDO (<100µV at 1.6A load)
  • Comprises two high-performance buck regulators for creating adjustable outputs
  • Adaptive drop on LDO, special circuit keeps LDO output always 1V below LDO input
  • Capable of switching frequency synchronization with ultrasound master or system clock frequency

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM73605  3.5V to 36V, 5A Synchronous Step-Down Voltage Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LMR14050  40V, 5A SIMPLE SWITCHER, 2.2MHz Step-Down Regulator with 40μA IQ  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TL431  Adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TLV2171  36V, Low Power, RRO, General Purpose Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A33  -3V to -36V Vin, 1A output current, ultra-low-noise, high-PSRR, low-dropout (LDO) linear regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36-V, 1-A, 4.17-μVRMS, RF low-dropout (LDO) voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM73605 Download Download
LMR14050 Download Download
TL431 Download Download
Download Download
Download -
Download Download
Download Download
Download Download
Download Download
Download -
Download Download
TLV2171 Download
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TPS7A33 Download Download
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TPS7A47 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

Application notes (1)
Title Abstract Type Size (KB) Date
PDF 909 25 Jun 2018
User guides (1)
Title Abstract Type Size (KB) Date
PDF 2192 29 Sep 2017
Design files (6)
Title Abstract Type Size (KB) Date
ZIP 1681 29 Sep 2017
ZIP 3206 29 Sep 2017
PDF 1425 29 Sep 2017
PDF 305 29 Sep 2017
PDF 197 29 Sep 2017
PDF 363 29 Sep 2017
Related Tools & Software

Reference Designs  ( 1 )


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